Just just put it together yesturday and when I press on the power button nothing comes on. I followed the mobo instructions and everything looks like it's in place. I was grounded when handling the motherboard, so I don't think it's shot. The CPU was put in right and so was the fan.

specs:

Corsair TX650W 650W ATX 12V 52A 24PIN ATX Power Supply Active PFC 120MM Fan

Gigabyte GA-MA785GT-UD3H AMD785G ATX AM3 2PCI-E DDR3 Video Sound GLAN CrossFireX HDMI Motherboard

Corsair XMS3 CMX4GX3M2A1600C9 4GB DDR3 2X2GB DDR3-1600 CL 9-9-9-24 Core i5 Dual Channel Memory Kit

AMD Phenom II X4 955 Black Edition Quad Core Processor 3.2GHZ AM3 8MB Cache 125W Retail Box

Seagate Barracuda 7200.12 500GB SATA2 3.5IN 8.5MS 7200RPM 16MB Hard Drive OEM

Coolermaster CM 690 Mid Tower Black ATX Case 5X5.25 5X3.5INT No PS Front USB Sound Firewire & eSATA

LG GH24LS50 24X Super Multi SATA DVD Writer OEM Black

XFX Radeon HD 5770 850MHZ 1GB 4.8GHZ GDDR5 2XDVI HDMI Display Port DIRECTX11 PCI-E Video CARD-

did you connect the buttons in the front of your case to the motherboard?

If you have a power switch on the back of the power supply, make sure it's on "-" and not "o"

TO test the power supply to see if it will turn on you can take a paper clip and connect the GREEN wire on the 24 Pin connector to a BLACK, aka ground, cable on the 24 Pin connector.

The green cable is the Power On cable, if this method doesn't turn on the PSU that means you will need to RMA it.

hell, recheck the 8 pin cpu plug and the 24 Main connector.