I'm the IT guy for our factory and I'm trying to determine what has killed several PCs.
Here's the scenario - a computer runs fine but one day it either refuses to power on by the button or, we're using it and it suddenly shuts off, then refusing to come on by the button.
If the unit is unplugged and then plugged back in it suddenly comes on but never posts. Swapping power supplies has no effect. The moment the PSU is plugged in (and if it has a switch on it, the switch is on) the system fans start and all the case lights come on (both power and HD LEDs even though no IDE cables are connected).
I've pulled the wires from the front panel header in case the front power switch was stuck on. No effect. I've got a bare motherboard with only the power plugs attached, a cpu, cpu fan, and memory and NO OTHER WIRES OR ADAPTERS. The second the power is plugged in the fan comes on. If the power supply 20 pin connector is not connected the power supply stays off.
I've seen this happen about four times to different systems scattered throughout the factory and plugged into surge protectors. Twice it has been an E-Machine with an AMD socket 754 and a power supply that had no on/off toggle build directly into the PSU.
This time it happened to a brand new MSI K8MM3 motherboard. It posted fine yesterday. Today I set the BIOS to use 'Cool and Quiet' and "Smart Fan" and when I went to view the motherboard hardware status screen the screen went black and the system died. Once I pulled the plug and plugged it back in, the "living dead syndrome" started. Fans all on but no post.
Is this a common problem for other people? Has anyone ever found the source of the problem?