After disconnecting and reconnecting my HP Pavilion T490 desktop to the mains, it refuses to start. The PSU makes a ticking / clicking noise and the LED on the back flashes / blinks. A few months back, after returning from vacation, I had the exact same issue, but it worked after a few tries. I worked through the HP Power Supply troubleshooting doc and talked to an online help employee. The PSU fails to work as soon as I plug in the 20 pin ATX-connector in the motherboard (both with and without all PCI/AGP cards and memory modules). If I hardwire ATX pin 14 to a ground pin, the HD and CD/DVD's spin up. After all these test, I'm still not sure what the problem is. The PSU or the motherboard. The machine still falls under warranty, but, if it is the PSU, I'll replace it myself with a higher quality higher wattage model (currently is a Bestec 250W ATX). If it is the motherboard, I'll use the warranty (aren't any shops here which sell microATX socket 478 SATA/Firewire boards anyway). Anyone got a clue what the issue is here? I've googled arround; found similiar problems, but never definate answers as to what is the problem.