New Gaming Build - need your help please

I have been reading these forums for a few weeks and decided to try to build my own gaming computer to replace my Dell XPS Gen 5. This is my first build ever.

After some research I purchased the following:

CPU: Intel Core 2 Duo E6750 (plan to OC some)
http://www.newegg.com/Product/Prod [...] 6819115029
Mobo: Asus P5E LGA 775 Intel X38 ATX
http://www.newegg.com/Product/Prod [...] 6813131219
GPU: Sapphire 100215L Radeon HD 3870 512mb (plan to get another for Crossfire because I game in 1900x1200)
http://www.newegg.com/Product/Prod [...] 6814102713
RAM: G.Skill 4GB (2x2GB) 240 Pin DDR2 1000 (PC2 8000)
[url] http://www.newegg.com/Product/Prod [...] 6820231145
HD: Western Digital Raptor WD1500ADFD 150GB Serial ATA 150 Hard Drive (Not planning on using Raid)
http://www.newegg.com/Product/Prod [...] 6822136012
Cpu Cooler:Arctic Freezer 7 Pro
http://www.newegg.com/Product/Prod [...] 6835186134
PSU: PC Power & Cooling Silencer 750W Quad
http://www.newegg.com/Product/Prod [...] 6817703009
Case: Antec 900 Black Steel ATX Mid http://www.newegg.com/Product/Prod [...] 03009Tower
http://www.newegg.com/Product/Prod [...] 6811129021
Samsung 20X Sata Dvd (Model SH-S203N) - OEM
http://www.newegg.com/Product/Prod [...] 6822136012
OS: Microsoft Windows 64-bit Ultimate for System Builders
http://www.newegg.com/Product/Prod [...] 6822136012
Will be using my existing dell 24 inch widescreen digital ultrasharp monitor in 1900x1200 as mentioned.

I finished putting together my system today. It took a bit longer than I thought, but I wanted to take my time and make sure I got it right. When I went to power up my system, all that happens is that the light on the "SupremeFXII" soundcard comes on and the green light on the Mobo lights up. Nothing else. No fans, no BIOS, no screen appears, nothing. I tried removing 1 stick of ram, and no dice. This is my very first build, so I am pretty much a noob at this sort of thing. I can tell you that I did use the provided Standoffs for the Mobo and plugged in the 8 pin and 24 pin power supply adapters to the Mobo as well. I am not sure what to do at this point. Is there a problem with having a SATA drive when you first boot up? I am grasping at straws here. Does anyone have some ideas that might help me? Thanks for your input.

Is the psu power switch on the back switched on?

You mean the ASUS Q-Connector Kit?

http://www.cdrinfo.com/Sections/Ar [...] 0606_8.jpg

Remove that. You can power it on by shorting the PWRSW pins with the tip of a ball pen. See manual for the whereabout.

Well, thanks for the suggestions. I ended up testing the power supply as suggested on PC Power & Cooling's website, and it looks like it is a bad power supply. Tested the GPU in my old computer and it works fine. Hopefully the Mobo is ok but I really have no way of knowing at this point. To rick, I went with the HD3870 because I plan on going Crossfire and it gives me a wider range of Mobos to choose from. If I was going with one GPU I would have went with an 8800GT.