BIOS screen corruption then boots

[dsaitta]

I have a home-built PC based on an ASUS motherboard and ATI 5670 video card. Everything was running fine for months, but a few days ago I started running into an issue where my BIOS screen would load but be complete corrupted (white screen with red horizontal lines going across), and then Windows 7 boots fine.

Also, when I wake the pc up from sleep mode, the computer will occasionally wake up but the monitor will not turn on, requiring a reboot. Outside of these two issues, I have no problems within Windows 7 doing everyday tasks.

Any idea where to start troubleshooting?

 

[Mark56]

First thing I would try is to remove the CMOS battery which will reset the Bios to defaults and then see what happens when you boot. While the battery is out test the voltage with a volt meter, if it is much lower than 3V replace it with a new one.

If no improvement you could try flashing the Bios. You would need to go to the motherboard's manufacturer's site to get the instructions and the Bios download.