How to diagnose beep codes
Posted on 2006-06-05
This is a PC with Win XP Pro installed. Multiple viruses were removed but still a fault remained so I wanted to do a repair install. The PC was not booting off the CD, so as the CMOS chip has an AMIBIOS sticker on it I hit the DEL key during boot, but it kept going to XP. I wanted to get to the BIOS to change the boot order. So next time I started the PC I hit the DEL Key many many times.
Now there is no BIOS screen displayed when I start. In fact nothing appears on the screen ! I do hear a beep, then a long (5 seconds) delay followed by two beeps then a single beep. If I attach a POST card it displays 75.A2 If I attach a micro-POST it displays .85
I have disconnected the mains power and removed the BIOS battery for 12 hours, but the problem remains. There are no markings on the mobo to identify the manufacturer. When the PC was bootable I ran Belarc and it gave
BIOS: American Megatrends Inc. 062710 07/15/97