HELP! Display Problems with new PREMIUM i7 HTPC!!!

[CJust]

I have just put together a premium HTPC... First time build.. of the following components:

Thermaltake DH-102 w 7' touchscreen
ASUS P6T Deluxe
i7 920 w Stock Cooler
6gb RAM
Sapphire Radeon HD 4870 512mb ddr5
LG Super Multi-Blue BD/HDDVD/dvd optical Drive
WD 500gb HDD 7200 rpm
Asus Xonar D2 7.1
Dual HD TV Tuner
Wireless Adapter
550w PSU


I just finished putting everything together and I went to turn the system on for the first time and I can't get anything to display or any type of beeps from the system at initial boot to show any error. All of the components are receiving power and running. I've already tried taking it all apart, confirmed correct assembly and rechecked all connections. Still nothing. I am really hoping I can figure this out. Any ideas?

Thanks for your help.

[The Sorcerer]

Which psu?Awfully lot of components to claim it as an htpc.

[foruamit2004]

^^^ have you tried connecting with other monitor, gfx card is coneected via 2 x 6 pin connectors??

[NVIDIAGeek]

Make sure you have all the wires and pins connected thoroughly & post your answer