Sata Power Contacts First Time Building A Computer Myself, It Won't Start.?

First time building a computer myself, it won't start.? - sata power contacts

I think I have eveything connected, the video card, motherboard, processor, and witnesses are all connected. The SB Power LED lights up green when you are connected, but pressing the power button does not work.

A board to know where to begin and what to look for? Here are my system specifications.

* Western Digital Caviar SE16 WD3200KSRTL 320 GB 7200 RPM SATA 3.0Gb / s Hard Drive - Retail


* Intel Core 2 Duo E8500 Wolfdale 3.16GHz LGA 775 65W Dual-Core Processor Model BX80570E8500 - Retail (N82E16819115036)


* LITE-ON 20X DVD ± R DVD Burner Black SATA Model iHAS120-08 - Retail


* Antec NeoPower 650 650W ATX12V / EPS12V SLI Ready CrossFire Ready Modular Active PFC Power Supply - Retail


* Sunbeam CR-CCTF 120mm "Core Contact Freezer CPU Cooler - Retail


* Antec Nine Hundred Black Steel ATX Mid Tower Computer Case - Retail


* H487F512P Hightech Radeon HD 4870 512MB Their 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card - Retail
[Question:has a separate space for 2 PCI cards, Power E, so I assume that the needs of both? a 6-pin PCI-E is a small 2-pin with him, but I see no place to go.]

* ASUS P5Q Pro Socket 775 Intel P45 ATX Intel Motherboard - Retail

* Mushkin 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model 996,587 - Retail