Computer won't post if i enter bios

[jim5000]

At the moment, my bios settings are all incorrect, they are at the settings that you get if you clear the bios completly with the jumper. My memory timings are wrong, the cpu is set to the wrong speed, the boot devices are all wrong etc. etc.

The problem is, if I enter the bios to change anything, even if it is only whether to display the boot logo or post screen, the computer refuses to boot until i clear the cmos again. Sometimes the computer won't turn on at all until i clear the cmos, and sometimes doing a soft reboot from windows sends it to sleep until, you guessed it, i clear the cmos again.

Does anyone have any idea why this is happening and how i can fix it it? Specs are

Abit AN-8
A64 3000 venice
2gig OC value ram
500w psu (without a 24-pin connector)

 

[jim5000]

Right, I've changed the memory and tried booting with a minimal setup (cpu, gfx card, memory) and am still having the same problem, the bios HAS to be reset befor the computer will turn on at all. If i reboot, i have to clear the bios before it will boot.

The cpu temps seem to be fine (29oC in windows), and I have tried changing the memory but it doesn't seem to make a difference.

Can anyone tell me what the default settings (fsb\multi) for and a64 3000 are, and also, what should I be putting in the memory section for default speeds (I think its pc2700 ddr memory) as i think this may be causing a problem. When i reset the bios and it actually boots, I get a speed error, press f1 to continue...

This is what it is currently running at (1 stick of 512mb memory rather than the normal 2 1gig sticks)

If anyone can help I will love them forever!!

 

[jim5000]

Huzzah

I downloaded the latest update for the bios, and touch wood, everything seems to be working. I have everything at what I think is default, do these speeds look right? I'm mostly thinking the memory might be abit underclocked? Both memory sticks are the same, I remember I used to have them clocked quite highly. Should I stick the HT back onto DDR400?