Corrupted NVRAM data stopped Windows 7 boot and BIOS access
A few days ago, a client of mine had a computer which kept displaying a blue screen when booting into Windows 7, and the USB keyboard was not working.
Since the motherboard had PS/2 ports, they worked, but I still could not get access to the BIOS.
So I tried using the Clear CMOS jumper which fixed this problem (the USB keyboard worked after all) and after fixing up the BIOS settings, the system booted with no problem.
This client said that a surge got in and only took out a surge protector connected to their computer - I think some noise got through the 5V standby supply and corrupted the NVRAM, which disabled the USB ports and access to the BIOS menus.
Since the motherboard had PS/2 ports, they worked, but I still could not get access to the BIOS.
So I tried using the Clear CMOS jumper which fixed this problem (the USB keyboard worked after all) and after fixing up the BIOS settings, the system booted with no problem.
This client said that a surge got in and only took out a surge protector connected to their computer - I think some noise got through the 5V standby supply and corrupted the NVRAM, which disabled the USB ports and access to the BIOS menus.
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