diduknowthat

So, my friend recently built a computer with these specs:

VGA XFX 7900GT 256MB PV-T71G-UDF
MB GIGABYTE GA-965P-DS3 P965 775
CPU INTEL|CORE 2 E6300 1.86G 775 R
MEM 512Mx2|PTR DII800 PDC21G6400LLK
160 gig hitachi sata
raidmax case with no PC speaker! CASE RAIDMAX|ATX-921WSP SIL/RED RT
PSU ROSEWILL RV450S-2 RETAIL

So, another friend helped the first friend built the computer. However, the computer does not send out any video signal on boot. Also, my friend checked the 7900GT in my own computer, and it works fine. Does anyone have any other ideas? (for example, how to determine problem without another Core 2 Duo system, which does not exist in the circle of friends) Thanks.

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Dell Latitude XT Convertible Tablet
Intel Core 2 Duo U7600 1.2ghz CPU
3GB DDR2 677 Memory
120GB 1.8" PATA Hard Drive
ATI Radeon Xpress 1250 Graphics
12.1" WXGA LED Touch Screen
N-Trig Capacitive Touch/Active Digitizer