Installed Manjaro, it worked, but now won't boot anymore

[Wollie]

Not necessarily a hardware issue, could be a bug. Try this:

Mce: [Hardware Error] on startup

In your case I would try some kernel parameters. They can be changed by: Use nano to edit /etc/default/grub: sudo nano /etc/default/grub Add the kernel parameter you want inside the quotes to the line starting GRUB_CMDLINE_LINUX_DEFAULT= Save the change by pressing CTRL+O together. Then exit with CTRL+X. Update grub with sudo update-grub In your case I would test the kernel parameters mce=off and mce=nobootlog https://www.kernel.org/doc/Documentation/x86/x86_64/boot-options.txt