cant go to boot menu because of "input not supported" showing on the screen

Check your keyboard and mouse connections.
Also more information would be helpful

Also suspect mouse or keyboard.
Try using a asb keyboard or mouse


Hope this helps
Grant - South Africa

I think I saw this once when there was a disk in my optical drive and boot from CD was the first option in the bios. Since the CD was not of the boot-able type, the system threw out this error. Once I ejected the CD everything went back to normal. A non-boot-able floppy can do the same thing with boot from floppy set first in the bios on older systems.