My old ThinkCenter M-8143 doesn't boot. When I press the power button nothing happens. It's a brand new power supply, so can't be an issue with the PSU.
*If I remove the 4-pin CPU power connector and just leave the 24-pin ATX connector (http://www.legitreviews.com/images/reviews/418/gigabyte_ds3_labeled.jpg) and I plug in the power cable, CPU fan starts spinning. But it doesn't do so with both the connectors plugged in.
*There are 4 wires (2 yellow, 2 black) coming out of the power button switch and I tried shorting either of yellow-black wire pair; but nothing happens and it's still dead.
What could I do to get it working? I need it working.