M5A99X evo not posting, but only with a gtx660 card fitted

Rig spec:
M5A99X evo mobo
AMD 8120 black edition
16gb kingston hyperx 1600mhz ram
pny quadro 600 vga (trying to install an asus gtx660)
240gb ocz vertex 3 (boot drive)
2tb seagate barracuda
corsair hw750w psu.

Ive been pulling my hair out over this.
i wanted to upgrade my graphics, got a gtx660. when i fit it and boot up, it posts the cpu, ram and the vga but hangs on the boot. all while the bios hangs on the splash screen. ive flashed the latest bios and tried every possible hardware configuration. I've had the vga in another rig too and it worked. any ideas as to my problem?! would the ram be causing the problem, because it isnt on the mobo's qualified vendors list? its actually starting to depress me.
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  1. oh and i forgot to mention that my system runs perfectly with my pny quadro 600 vga. it never misses a beat!
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