Elusive GPU problem

Hey guys,

My problem began yesterday when I turned my computer on and got no display output..it was then I realised the fan on my 9800GTX+ wasn't spinning and the red LED was on....now I goggled and found out it meant either it was faulty or not enough power. I took it back to the place I bought it and they tested it on one of their machines and they told me it was faulty...soooo logically you'd buy a new GPU right ? I bought one...got home...put it in...same problem... >_> My specs are:

Asus P6T deluxe mobo
i7 920
850W power supply
3GB DDR3 ram
9800GTX+

Help would greatly be appreciated.

*NOTE* The new graphics card I bought was an average one and didn't need power from the PSU.

Thank you
Max