Unable to boot after install, stuck getting a blinking "_"

So I just installed using the GUI and every time I restart or try to reinstall I get thrown to a screen and it isn't booting

welcome to the forum, you'll find that providing useful info will yield actual helpful responses.

but for now, boot the manjaro usb (doesnt matter if you choose free or nonfree, whatever boots). connect to wifi/network, open a terminal and provide the output of:

inxi -Fxxxz

would this happen to be an optimus laptop (intel/nvidia) by any chance? if yes, not a big deal, this is common.

also, when posting terminal output use the </> button above the post entry box before posting or put 3 backtics above and below the terminal output so it's formatted properly.

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System:    Host: manjaro Kernel: 4.19.28-1-MANJARO x86_64 bits: 64 compiler: gcc v: 8.2.1 Desktop: Xfce 4.13.2git-UNKNOWN 
           tk: Gtk 3.24.3 info: xfce4-panel wm: xfwm4 dm: LightDM 1.28.0 Distro: Manjaro Linux 
Machine:   Type: Desktop Mobo: ASUSTeK model: P7H55-M PRO v: Rev 1.xx serial: <filter> BIOS: American Megatrends v: 0802 
           date: 03/25/2010 
CPU:       Topology: Quad Core model: Intel Xeon X3430 bits: 64 type: MCP arch: Nehalem rev: 5 L2 cache: 8192 KiB 
           flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 19264 
           Speed: 1204 MHz min/max: 1200/2401 MHz boost: enabled Core speeds (MHz): 1: 1204 2: 1204 3: 1204 4: 1204 
Graphics:  Device-1: NVIDIA GK110 [GeForce GTX 780] vendor: ASUSTeK driver: nouveau v: kernel bus ID: 01:00.0 
           chip ID: 10de:1004 
           Display: x11 server: X.Org 1.20.4 driver: nouveau unloaded: modesetting alternate: fbdev,nv,vesa 
           resolution: 1920x1080~60Hz 
           OpenGL: renderer: NVF1 v: 4.3 Mesa 18.3.4 direct render: Yes 
Audio:     Device-1: Intel 5 Series/3400 Series High Definition Audio vendor: ASUSTeK driver: snd_hda_intel v: kernel 
           bus ID: 00:1b.0 chip ID: 8086:3b56 
           Device-2: NVIDIA GK110 HDMI Audio vendor: ASUSTeK driver: snd_hda_intel v: kernel bus ID: 01:00.1 
           chip ID: 10de:0e1a 
           Sound Server: ALSA v: k4.19.28-1-MANJARO 
Network:   Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: ASUSTeK M4A785/P7P55 driver: r8169 
           v: kernel port: d800 bus ID: 03:00.0 chip ID: 10ec:8168 
           IF: enp3s0 state: up speed: 100 Mbps duplex: full mac: <filter> 
Drives:    Local Storage: total: 761.99 GiB used: 80.4 MiB (0.0%) 
           ID-1: /dev/sda vendor: Drevo model: X1 SSD size: 55.90 GiB speed: <unknown> serial: <filter> rev: 1A scheme: MBR 
           ID-2: /dev/sdb vendor: Hitachi model: HDT721075SLA360 size: 698.64 GiB speed: <unknown> rotation: 7200 rpm 
           serial: <filter> rev: A31B scheme: MBR 
           ID-3: /dev/sdc type: USB vendor: Lexar model: USB Flash Drive size: 7.46 GiB serial: <filter> rev: 8.07 scheme: MBR 
Partition: ID-1: / size: 11.72 GiB used: 80.4 MiB (0.7%) fs: overlay source: ERR-102 
Sensors:   System Temperatures: cpu: 33.0 C mobo: N/A gpu: nouveau temp: 32 C 
           Fan Speeds (RPM): N/A gpu: nouveau fan: 1170 
Info:      Processes: 188 Uptime: 4m Memory: 15.63 GiB used: 1.03 GiB (6.6%) Init: systemd v: 241 Compilers: gcc: 8.2.1 
           Shell: bash v: 5.0.0 running in: xfce4-terminal inxi: 3.0.32 

This is not the optimus

So I managed to get manjaro working running the gnome desktop environment I followed the instruction in the below video

I also tried to begin it with xfce and the kde desktop environments but for some reason it would not load the desktop environment on boot. I was able to install both xfce and kde after first booting into gnome

I have recreated this boot drive and reinstalled 3 times to really make sure that this was gonna stick

Thank you dglt for your reply

https://www.youtube.com/watch?v=530O4InhR3A

Hello,

See if this works. How to change video drivers or configuration and troubleshoot

If you click on the magnifying glass and do a search for your error, You will find plenty of step by step answers.

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