BleepingComputer.com: Hardware Conundrum - No Power?

I've got a custom built system, and can't seem to get her to fire anymore. Let me start off by saying that my computer building experience is very limited, and a buddy built this system for me about 2 years ago.

The problems started when I upgraded to windows 7 ultimate. It fired up once or twice, but then nothing, and no power. Thinking it was the power supply, I jumped it using a technique I found on youtube to test the unit. I used a paperclip to jump the green wire & black wire (on the motherboard connection from the power supply) to see if a fan would spin up. It did. So next, I figured the motherboard had gone bad, so I sent that off to gigabyte. I just got the board back after they said they tested it, and everything was ok. I tried the running both the reset switch & power switch to the motherboard to see if it was a bad switch, and neither fired it up?

I'm not sure what it could be? For whatever reason, it looks like the motherboard is still not getting power. I plan on trying to test the voltages on the powersupply to see if it could still be the problem. Any other ideas on what else it could possibly be?

You're probably still looking at a faulty power supply. There are two plugs on a power supply you always want to test, the 20/24 pin motherboard plug and the 4/8 pin cpu plug. If those two plugs aren't getting the required voltage your machine won't start. To make things simpler for yourself, most computer shops carry small power supply testers and they go for $20 to $30. This method of testing is much simpler and just as accurate (and if you can, try to get one with a digital screen that actually shows you what voltage is coming out of each line).

Find the two terminals on the mobo where he front power switch on the case plugs in. Short those terminal momentarily and see if it fires up. I usually use a #2 phillips screw driver as the slots fit between the terminals just fine.

jumping the switches was a great suggestion. for whatever reason, the wires and mb were color coded differently, which was the reason for the confusion. Thanks for the tip! It worked!