pre-boot error please help

[Primarygun]

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.

[1veedo]

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

[Klaynos]

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

[Easybeat]

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.