Mysterious boot problem....

[mark_m]

My custom-built Tyan 2696 3XS System has been running just fine for four and half years.

Today I went to boot it up and I got a CMOS checksum error.
I cleared the CMOS.
Rebooted.
Now the POST process checks the memory and says "passed" but just hangs there at that point. Furthermore, it shows a different value for the memory each time, and none of them are correct.
It never goes to recognising keyboard or mouse.
I've taken out all the RAM but a single stick and tried different sticks.
Have taken out all add-in cards etc. except for GPU.
I can press F2 for Setup, and the screen changes to read "entering Setup" but never does.

The NumLock key responds, so the machine hasn't hung completely.

I've removed everything but a single stick of RAM (tried several different ones) and the GPU. But it's the same.

I am mystified.

Any guesses as to what's going on?

Thanks in anticipation

Mark

[Jay]

Did Scan build this system?

Here is a link to your other thread.

http://forums.hexus.net/help-quick-r...ml#post2190002

[mark_m]

Did Scan build this system?

Indeed they did, which is why I've also posted in this forum.

[Rob @ Scan]

Hi Mark,

Will it not let you enter the BIOS at any point? Even after you have cleared the CMOS? So you can manually configure the RAM.

If not, my initial guess would be the memory controller built into the CPU is failing.

If you can get hold of a processor to quickly drop in and test with, that would be my first port of call.

It's also worth disconnecting any drives, if you haven't tried this already.

Regards,
Rob