New computer has power but won't start (CPU fan isn't spinning either)

Going crazy...please help.

I built my new computer tonight, however it won't start. There is power to the motherboard, because I can hear and see the fans when I turn it on, however the CPU fan doesn't move. It initially spins a rotation or two and that is it. It (fan on CPU) does the same thing when I power it off, just a initial spin but doesn't move. Any ideas...I would be so grateful. Here are my system specs (all bought from Newegg)

Intel Core 2 Duo E6750 Conroe 2.66GHz LGA 775 65W Dual-Core Processor
GIGABYTE GA-P35-DS3L LGA 775 Intel P35 ATX Intel Motherboard
Rosewill RP550-2 ATX12V v2.01 550W Power Supply
4stick of - G.SKILL 1GB 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400)
APEVIA X-JUPITER-JR G-Type X-JPJGT-BK Black SECC Steel ATX Mid Tower Computer Case

Thanks so much!

recheck

Check and recheck you wiring for everything. There is a little switich and your PSU make sue that is where it was out of the box. Reinstall ram, try it with 2 gigs and jusy check everything. It is your wiring and last build I did we had the cords from front power button wrong, make sure those are correct, gl. make sure you did nor bend a pin when you installed prosessor.

I wouldn't worry about it yet if that's your only "problem." I have a Gigabyte motherboard (see my system specs) and the CPU fan twitches a bit at first until the CPU warms up a little then it goes normally.