Black screen with nothing but mouse pointer after boot and before login

It’s indeed an Nvidia 570.
But …

… did remove the Plymouth (which I don’t like in its default, anyway) but didn’t open the route to the log-in-screen.
The difference: screen is no more completely black but shows 1 “_” (underscore) in the top-left corner. It still doesn’t react on keyboard or mouse-click actions.

update-grub response as a supplement:

[manjaro-gnome ~]# manjaro-chroot -a
==> Mounting (ManjaroLinux) [/dev/nvme0n1p3]
 --> mount: [/mnt]
 --> mount: [/mnt/boot/efi]
 --> mount: [/mnt/home]
 --> mount: [/mnt/data]
[manjaro-gnome /]# update-grub
Generating grub configuration file ...
Found theme: /usr/share/grub/themes/manjaro/theme.txt
Found linux image: /boot/vmlinuz-6.12-x86_64
Found initrd image: /boot/intel-ucode.img /boot/amd-ucode.img /boot/initramfs-6.12-x86_64.img
Found initrd fallback image: /boot/initramfs-6.12-x86_64-fallback.img
Warning: os-prober will be executed to detect other bootable partitions.
Its output will be used to detect bootable binaries on them and create new boot entries.
ERROR: mkdir /var/lock/dmraid
Adding boot menu entry for UEFI Firmware Settings ...
Root filesystem isn't btrfs
If you think an error has occurred, please file a bug report at "https://github.com/Antynea/grub-btrfs"
Found memtest86+ image: /boot/memtest86+/memtest.bin
/usr/bin/grub-probe: warning: unknown device type nvme0n1.
Found memtest86+ EFI image: /boot/memtest86+/memtest.efi
/usr/bin/grub-probe: warning: unknown device type nvme0n1.
done
[manjaro-gnome /]# 

any noticeable problems?

… and the inxi output from some days ago (with KDE running):

System:
  Kernel: 6.12.25-1-MANJARO arch: x86_64 bits: 64 compiler: gcc v: 14.2.1
    clocksource: tsc avail: acpi_pm
    parameters: BOOT_IMAGE=/boot/vmlinuz-6.12-x86_64
    root=UUID=ad04c26f-ab5f-4bf3-99c9-3a28b2423a9f rw quiet splash
    resume=UUID=6c89b27c-c763-4e91-b5ee-679eb7fc3db7 udev.log_priority=3
  Desktop: KDE Plasma v: 6.3.4 tk: Qt v: N/A wm: kwin_x11 dm: SDDM
    Distro: Manjaro base: Arch Linux
Machine:
  Type: Laptop System: FUJITSU product: CELSIUS H780 v: N/A serial: <filter>
    Chassis: type: 10 serial: <filter>
  Mobo: FUJITSU model: FJNBB5D v: 757383-01R9500225 serial: <filter>
    part-nu: SK00 uuid: a41a3b37-7475-e911-8b14-a06610a7488b
    UEFI: FUJITSU // Insyde v: Version 1.22 date: 11/16/2023
Battery:
  ID-1: BAT1 charge: 81.0 Wh (95.3%) condition: 85.0/96.5 Wh (88.1%)
    volts: 16.5 min: 14.4 model: PAC CP722160-01 type: Li-ion serial: <filter>
    status: not charging cycles: 20
Memory:
  System RAM: total: 32 GiB available: 31 GiB used: 1.58 GiB (5.1%)
    igpu: 64 MiB
  Array-1: capacity: 64 GiB slots: 4 modules: 2 EC: None
    max-module-size: 16 GiB note: est.
  Device-1: ChannelA-DIMM0 type: DDR4 detail: synchronous size: 16 GiB
    speed: 2400 MT/s volts: curr: 1.2 min: 1.35 max: 1.35 width (bits): data: 64
    total: 64 manufacturer: SK Hynix part-no: HMA82GS6AFR8N-UH
    serial: <filter>
  Device-2: ChannelA-DIMM1 type: no module installed
  Device-3: ChannelB-DIMM0 type: DDR4 detail: synchronous size: 16 GiB
    speed: 2400 MT/s volts: curr: 1.2 min: 1.35 max: 1.35 width (bits): data: 64
    total: 64 manufacturer: SK Hynix part-no: HMA82GS6AFR8N-UH
    serial: <filter>
  Device-4: ChannelB-DIMM1 type: no module installed
PCI Slots:
  Message: No PCI Slot data found.
CPU:
  Info: model: Intel Core i7-8750H socket: BGA1440 bits: 64 type: MT MCP
    arch: Coffee Lake gen: core 8 level: v3 note: check built: 2018
    process: Intel 14nm family: 6 model-id: 0x9E (158) stepping: 0xA (10)
    microcode: 0xFA
  Topology: cpus: 1x dies: 1 clusters: 6 cores: 6 threads: 12 tpc: 2
    smt: enabled cache: L1: 384 KiB desc: d-6x32 KiB; i-6x32 KiB L2: 1.5 MiB
    desc: 6x256 KiB L3: 9 MiB desc: 1x9 MiB
  Speed (MHz): avg: 800 min/max: 800/4100 scaling: driver: intel_pstate
    governor: powersave volts: 0.8 V ext-clock: 100 MHz cores: 1: 800 2: 800
    3: 800 4: 800 5: 800 6: 800 7: 800 8: 800 9: 800 10: 800 11: 800 12: 800
    bogomips: 52815
  Flags: 3dnowprefetch abm acpi adx aes aperfmperf apic arat
    arch_capabilities arch_perfmon art avx avx2 bmi1 bmi2 bts clflush
    clflushopt cmov constant_tsc cpuid cpuid_fault cx16 cx8 de ds_cpl dtes64
    dtherm dts epb ept ept_ad erms est f16c flexpriority flush_l1d fma fpu
    fsgsbase fxsr ht hwp hwp_act_window hwp_epp hwp_notify ibpb ibrs ida
    intel_pt invpcid lahf_lm lm mca mce md_clear mmx monitor movbe mpx msr
    mtrr nonstop_tsc nopl nx pae pat pbe pcid pclmulqdq pdcm pdpe1gb pebs pge
    pln pni popcnt pse pse36 pti pts rdrand rdseed rdtscp rep_good sdbg sep
    smap smep ss ssbd sse sse2 sse4_1 sse4_2 ssse3 stibp syscall tm tm2
    tpr_shadow tsc tsc_adjust tsc_deadline_timer vme vmx vnmi vpid x2apic
    xgetbv1 xsave xsavec xsaveopt xsaves xtopology xtpr
  Vulnerabilities:
  Type: gather_data_sampling mitigation: Microcode
  Type: itlb_multihit status: KVM: Split huge pages
  Type: l1tf mitigation: PTE Inversion; VMX: conditional cache flushes, SMT
    vulnerable
  Type: mds mitigation: Clear CPU buffers; SMT vulnerable
  Type: meltdown mitigation: PTI
  Type: mmio_stale_data mitigation: Clear CPU buffers; SMT vulnerable
  Type: reg_file_data_sampling status: Not affected
  Type: retbleed mitigation: IBRS
  Type: spec_rstack_overflow status: Not affected
  Type: spec_store_bypass mitigation: Speculative Store Bypass disabled via
    prctl
  Type: spectre_v1 mitigation: usercopy/swapgs barriers and __user pointer
    sanitization
  Type: spectre_v2 mitigation: IBRS; IBPB: conditional; STIBP: conditional;
    RSB filling; PBRSB-eIBRS: Not affected; BHI: Not affected
  Type: srbds mitigation: Microcode
  Type: tsx_async_abort status: Not affected
Graphics:
  Device-1: Intel CoffeeLake-H GT2 [UHD Graphics 630] vendor: Fujitsu
    driver: i915 v: kernel arch: Gen-9.5 process: Intel 14nm built: 2016-20
    ports: active: eDP-1 empty: none bus-ID: 00:02.0 chip-ID: 8086:3e9b
    class-ID: 0300
  Device-2: NVIDIA GP107GLM [Quadro P600 Mobile] vendor: Fujitsu
    driver: nvidia v: 570.144 alternate: nouveau,nvidia_drm
    non-free: 550-570.xx+ status: current (as of 2025-04; EOL~2026-12-xx)
    arch: Pascal code: GP10x process: TSMC 16nm built: 2016-2021 pcie: gen: 1
    speed: 2.5 GT/s lanes: 16 link-max: gen: 3 speed: 8 GT/s ports:
    active: none empty: DP-1, DP-2, DP-3, DP-4, DP-5 bus-ID: 01:00.0
    chip-ID: 10de:1cbc class-ID: 0300
  Device-3: Chicony FJ Camera driver: uvcvideo type: USB rev: 2.0
    speed: 480 Mb/s lanes: 1 mode: 2.0 bus-ID: 1-7:4 chip-ID: 04f2:b3b4
    class-ID: 0e02 serial: <filter>
  Display: unspecified server: X.Org v: 21.1.16 with: Xwayland v: 24.1.6
    compositor: kwin_x11 driver: X: loaded: modesetting,nvidia
    alternate: fbdev,nouveau,nv,vesa dri: iris gpu: i915 display-ID: :0
    screens: 1
  Screen-1: 0 s-res: 1920x1080 s-dpi: 96 s-size: 508x285mm (20.00x11.22")
    s-diag: 582mm (22.93") monitors: <missing: xrandr>
  Monitor-1: eDP-1 model: BOE Display 0x0630 built: 2016 res: 1920x1080
    dpi: 142 gamma: 1.2 chroma: red: x: 0.584 y: 0.365 green: x: 0.349 y: 0.580
    blue: x: 0.161 y: 0.141 white: x: 0.314 y: 0.329
    size: 344x194mm (13.54x7.64") diag: 395mm (15.5") ratio: 16:9
    modes: 1920x1080
  API: EGL v: 1.5 hw: drv: intel iris drv: nvidia nouveau drv: nvidia
    platforms: device: 0 drv: nvidia device: 1 drv: nouveau device: 2 drv: iris
    device: 3 drv: swrast gbm: drv: nvidia surfaceless: drv: nvidia x11:
    drv: iris inactive: wayland
  API: OpenGL v: 4.6.0 compat-v: 4.5 vendor: intel mesa v: 25.0.4-arch1.1
    glx-v: 1.4 direct-render: yes renderer: Mesa Intel UHD Graphics 630 (CFL
    GT2) device-ID: 8086:3e9b memory: 15.14 GiB unified: yes
  API: Vulkan v: 1.4.309 layers: 1 device: 0 type: discrete-gpu
    name: Quadro P600 driver: nvidia v: 570.144 device-ID: 10de:1cbc
    surfaces: xcb,xlib
  Info: Tools: api: clinfo, eglinfo, glxinfo, vulkaninfo
    de: kscreen-console,kscreen-doctor gpu: nvidia-settings,nvidia-smi
    wl: wayland-info x11: xdpyinfo,xprop
Audio:
  Device-1: Intel Cannon Lake PCH cAVS vendor: Fujitsu driver: snd_hda_intel
    v: kernel alternate: snd_soc_avs,snd_sof_pci_intel_cnl bus-ID: 00:1f.3
    chip-ID: 8086:a348 class-ID: 0403
  Device-2: NVIDIA GP107GL High Definition Audio vendor: Fujitsu
    driver: snd_hda_intel v: kernel pcie: gen: 3 speed: 8 GT/s lanes: 16
    bus-ID: 01:00.1 chip-ID: 10de:0fb9 class-ID: 0403
  API: ALSA v: k6.12.25-1-MANJARO status: kernel-api with: aoss
    type: oss-emulator tools: alsactl,alsamixer,amixer
  Server-1: JACK v: 1.9.22 status: off tools: N/A
  Server-2: PipeWire v: 1.4.2 status: n/a (root, process) with:
    1: pipewire-pulse status: active 2: wireplumber status: active
    3: pipewire-alsa type: plugin tools: pactl,pw-cat,pw-cli,wpctl
Network:
  Device-1: Intel Cannon Lake PCH CNVi WiFi driver: iwlwifi v: kernel
    bus-ID: 00:14.3 chip-ID: 8086:a370 class-ID: 0280
  IF: wlp0s20f3 state: down mac: <filter>
  Device-2: Intel Ethernet I219-LM vendor: Fujitsu driver: e1000e v: kernel
    port: N/A bus-ID: 00:1f.6 chip-ID: 8086:15bb class-ID: 0200
  IF: enp0s31f6 state: up speed: 1000 Mbps duplex: full mac: <filter>
  IP v4: <filter> type: dynamic noprefixroute scope: global
    broadcast: <filter>
  IP v6: <filter> type: dynamic noprefixroute scope: global
  IP v6: <filter> type: dynamic noprefixroute scope: global
  IP v6: <filter> type: noprefixroute scope: link
  IF-ID-1: wwp0s20f0u4i12 state: down mac: <filter>
  Info: services: NetworkManager, systemd-timesyncd, wpa_supplicant
  WAN IP: <filter>
Bluetooth:
  Device-1: Intel Bluetooth 9460/9560 Jefferson Peak (JfP) driver: btusb
    v: 0.8 type: USB rev: 2.0 speed: 12 Mb/s lanes: 1 mode: 1.1 bus-ID: 1-14:6
    chip-ID: 8087:0aaa class-ID: e001
  Report: rfkill ID: hci0 rfk-id: 2 state: up address: see --recommends
Logical:
  Message: No logical block device data found.
RAID:
  Message: No RAID data found.
Drives:
  Local Storage: total: 476.94 GiB used: 13.4 GiB (2.8%)
  SMART Message: Required tool smartctl not installed. Check --recommends
  ID-1: /dev/nvme0n1 maj-min: 259:0 vendor: Samsung
    model: MZVLB512HAJQ-00007 size: 476.94 GiB block-size: physical: 512 B
    logical: 512 B speed: 31.6 Gb/s lanes: 4 tech: SSD serial: <filter>
    fw-rev: EXA7302Q temp: 27.9 C scheme: GPT
  Message: No optical or floppy data found.
Partition:
  ID-1: / raw-size: 93.13 GiB size: 91.11 GiB (97.83%) used: 12.13 GiB (13.3%)
    fs: ext4 block-size: 4096 B dev: /dev/nvme0n1p3 maj-min: 259:3
    label: sme500.manjaro_k uuid: ad04c26f-ab5f-4bf3-99c9-3a28b2423a9f
  ID-2: /boot/efi raw-size: 954 MiB size: 952.1 MiB (99.80%)
    used: 424 KiB (0.0%) fs: vfat block-size: 512 B dev: /dev/nvme0n1p1
    maj-min: 259:1 label: sme500_efi uuid: ECC7-B9AD
  ID-3: /home raw-size: 93.13 GiB size: 91.11 GiB (97.83%)
    used: 1.26 GiB (1.4%) fs: ext4 block-size: 4096 B dev: /dev/nvme0n1p4
    maj-min: 259:4 label: sme500.mk_home
    uuid: 5d4ed9e7-3964-42ee-9a65-65b09c190c4d
Swap:
  Kernel: swappiness: 60 (default) cache-pressure: 100 (default) zswap: no
  ID-1: swap-1 type: partition size: 36.32 GiB used: 0 KiB (0.0%)
    priority: -2 dev: /dev/nvme0n1p2 maj-min: 259:2 label: N/A
    uuid: 6c89b27c-c763-4e91-b5ee-679eb7fc3db7
Unmounted:
  Message: No unmounted partitions found.
USB:
  Hub-1: 1-0:1 info: hi-speed hub with single TT ports: 16 rev: 2.0
    speed: 480 Mb/s (57.2 MiB/s) lanes: 1 mode: 2.0 chip-ID: 1d6b:0002
    class-ID: 0900
  Device-1: 1-3:2 info: Areson Corp Elecom MR-K013 Multicard Reader
    type: keyboard,mouse driver: hid-generic,usbhid interfaces: 2 rev: 1.1
    speed: 12 Mb/s (1.4 MiB/s) lanes: 1 mode: 1.1 power: 100mA
    chip-ID: 25a7:fa61 class-ID: 0301
  Device-2: 1-4:3 info: Sierra Wireless EM7455 type: communication,CDC-data
    driver: cdc_mbim interfaces: 5 rev: 2.0 speed: 480 Mb/s (57.2 MiB/s)
    lanes: 1 mode: 2.0 power: 500mA chip-ID: 1199:9075 class-ID: 0a00
    serial: <filter>
  Device-3: 1-7:4 info: Chicony FJ Camera type: video driver: uvcvideo
    interfaces: 2 rev: 2.0 speed: 480 Mb/s (57.2 MiB/s) lanes: 1 mode: 2.0
    power: 500mA chip-ID: 04f2:b3b4 class-ID: 0e02 serial: <filter>
  Device-4: 1-14:6 info: Intel Bluetooth 9460/9560 Jefferson Peak (JfP)
    type: bluetooth driver: btusb interfaces: 2 rev: 2.0
    speed: 12 Mb/s (1.4 MiB/s) lanes: 1 mode: 1.1 power: 100mA
    chip-ID: 8087:0aaa class-ID: e001
  Hub-2: 2-0:1 info: super-speed hub ports: 10 rev: 3.1
    speed: 10 Gb/s (1.16 GiB/s) lanes: 1 mode: 3.2 gen-2x1 chip-ID: 1d6b:0003
    class-ID: 0900
Sensors:
  System Temperatures: cpu: 39.0 C pch: 40.0 C mobo: N/A
  Fan Speeds (rpm): N/A
Repos:
  Packages: pm: pacman pkgs: 1201 libs: 327 tools: pamac pm: flatpak pkgs: 0
  Active pacman repo servers in: /etc/pacman.d/mirrorlist
    1: https://mirrors.cicku.me/manjaro/stable/$repo/$arch
    2: https://mirror.dkm.cz/manjaro/stable/$repo/$arch
    3: https://mirror.komelt.dev/manjaro/stable/$repo/$arch
    4: https://mirror.futureweb.be/manjaro/stable/$repo/$arch
    5: https://quantum-mirror.hu/mirrors/pub/manjaro/stable/$repo/$arch
    6: https://ftpmirror1.infania.net/mirror/manjaro/stable/$repo/$arch
    7: http://kartolo.sby.datautama.net.id/manjaro/stable/$repo/$arch
    8: https://mirror.aarnet.edu.au/pub/manjaro/stable/$repo/$arch
Processes:
  CPU top: 5 of 259
  1: cpu: 1.9% command: kwin_x11 pid: 882 mem: 180.6 MiB (0.5%)
  2: cpu: 1.6% command: Xorg pid: 685 mem: 132.6 MiB (0.4%)
  3: cpu: 1.3% command: kwrite pid: 1625 mem: 168.2 MiB (0.5%)
  4: cpu: 1.0% command: plasmashell pid: 919 mem: 306.7 MiB (0.9%)
  5: cpu: 0.9% command: konsole pid: 1278 mem: 109.3 MiB (0.3%)
  Memory top: 5 of 259
  1: mem: 306.7 MiB (0.9%) command: plasmashell pid: 919 cpu: 1.0%
  2: mem: 186.2 MiB (0.5%) command: thumbnail.so started-by: kioworker
    pid: 1762 cpu: 0.1%
  3: mem: 180.6 MiB (0.5%) command: kwin_x11 pid: 882 cpu: 1.9%
  4: mem: 168.2 MiB (0.5%) command: kwrite pid: 1625 cpu: 1.3%
  5: mem: 132.6 MiB (0.4%) command: Xorg pid: 685 cpu: 1.6%
Info:
  Processes: 259 Power: uptime: 10m states: freeze,mem,disk suspend: deep
    avail: s2idle wakeups: 0 hibernate: platform avail: shutdown, reboot,
    suspend, test_resume image: 12.37 GiB services: org_kde_powerdevil,
    power-profiles-daemon, upowerd Init: systemd v: 257 default: graphical
    tool: systemctl
  Compilers: N/A Shell: Sudo (sudo) v: 1.9.16p2 default: Bash v: 5.2.37
    running-in: konsole inxi: 3.3.38