Shuttle XPC get lights nad fan spins, nothing else though

[ersatz]

This computer is a few years old and ran fine until a mont hago. You push the power button and the leds on the front light up and the fan spins at high speed and then nothing else. No output to monitor and no reading from drives.

Every once in awhile it will boot and run fine but when shutdown it won't boot again. Normally you press the button and the ran revs up to high speed then goes back to a normal running speed and you see the POST on the monitor. I've pulled the CPU, RAM, etc and put them in another PC to confirm they are working. Checked all components in the shuttle and they are plugged in properly.

I'm guessing it's the mobo even though there are no clear signs of it being burnt or shorted out anywhere. But the weird thing it it would work once every 400 or so power cycles. I've pulled the battery out, cleared the cmos, checked all connections and nothing.

It seems to me that the mobo is awaiting some respone, maybe temp response or something. The fans just spin on high endlessly so I thought initially it might be the heatsink or cpu. CPU tests fine and is reconnected properly to mobo.

Any suggestions?

 

[robisbell]

which model of XPC? I had a SN45G kept using the same size PSU it came with had kept having issues, upgraded the PSU to the 400W one and it ran fine. you can use a regular PSU to test to see if the it can get the system to boot up.

 

[ersatz]

It's a sb83g5 and I did try a full size PS and was even able to use the shuttle one to power a Dell PC. So I don't believe it's the PS adn a different one had the same result and hte shuttle one worked in another pc.

 

[robisbell]

then it's a dead board, I'd look at a diferent XPC or maybe moving the parts into a regular system.

 

[ersatz]

Thanks, that's what I thought. I already have the hd in a usb enclosure and the other components are so old I'll just give them to somebody.

 

[robisbell]

glad you were able to reuse the HDD.