My computer got a terrible error. More Precisely, there are two errors.

My computer reboots on and off. This is the terrible symptom I experience.

 

When I check the BIOS, I noticed two things.

There are two pre-boot errors.

Pre-boot error: Memory size decreased

Pre-boot error: Keyboard not functional

 

Does anyone have idea?

I've bought a new keyboard with the connection USB instead of the old PS2.

Recently, my computer reboots even at the BIOS panel.

I am afraid the situation is worsening.

It keeps rebooting then most likely the motherboard is coroded, grounded (metal screws?)...the circuits are crazy. The kewboard might be malfunctioning and causing short circuits or something. I had a similar problem a while back and had to buy a whole new bare bone. The new computer kicks ass though.

 

http://www.scienceforums.net/forums/showthread.php?t=10777#5

I would also suggest the possibility of a heat issue. Some computers when they get too warm restart/shutdown...

It could be anyone of a hundred things but start with the simple stuff first.

 

Reset the CMOS as it may be just a bad setting.

Check the CPU temperature in the BIOS, if its over 60C it could well be the problem.

Remove and re-seat all components.

Remove individual components one at a time and keep re-booting until you find a culprit.

Remove the mobo from the case to see if there is a short.

 

 

Also does the system beep more than one short beep upon boot up? if so how many? Using beep codes is a good way to solve problems.