Trouble with Manjaro installation and HD partitions

So, I had windows 7 and Pop!_OS installed on separate HDDs. I decided to install manjaro(XFCE) next to pop to see what I prefer, created a bootable USB using balena etcher but skipped the verification after etching manjaro to the USB. I entered BIOS and in boot priority put the USB drive on top, booted to manjaro live and installed it creating a new partition. Now my HDD partitions look like this: 800gb normal storage, 100gb manjaro partition, 85gb pop os, 15gb swap for pop os. Installation was successful, but when I chose “reboot now”, the PC just frose on the vendor logo. When I removed the HDD it booted normaly.
So the question is, how can I remove the broken manjaro partition if the PC doesn’t boot while it’s connected?

Boot a Manjaro live ISO, then try if you can chroot into your system by

sudo manjaro-chroot -a

Please post then output of

inxi -Fxxxza --no-host
sudo parted -l
sudo efibootmgr -v
mhwd -l

That could be the problem.

You dont boot that drive first? I doubt it simply being connected would break anything if it wasnt actually initialized.

That’s the problem, just it being connected makes it impossible to boot the PC. I’ll probably try connecting it as an external drive.

What exactly is that supposed to do?

provides an output with a lot of important system information.

Output will provide information about your disks and partitions.

Tells details about your ESP and boot order.

Shows some installed drivers.