XFX Radeon HD4670, no signal on monitor when used.

Hey guys. I recently put together a new computer, and my situation with my graphics card has left me completely stumped at this point. I have a XFX Radeon HD4670 ( http://www.newegg.com/Product/Prod [...] 6814150450 ) for my graphics card, and the MS-7525 ( http://h20000.www2.hp.com/bizsuppo [...] peId=12454 ) for my motherboard. Also, my power supply is here: http://www.newegg.com/Product/Prod [...] 6817159045

My problem is that whenever I connect my monitor to my graphics card, the monitor will read "no signal". Also happens if I have the card in with the monitor plugged into the motherboard. The fan does indeed spin on the graphics card. I can only access the graphics if I take out the graphics card completely and use the onboard graphics. I have tried to disable the onboard graphics and changing my graphics settings in my bios to PCI-E rather than onboard or just PCI.
Also, if I turn the computer on with the graphics card in, not only will I get no signal, but I will not be able to turn off the computer with the power button.

Thanks for reading, appreciate any help I can get.

What type of cable are you using to connect monitor to PC? From the links you've given, are you using the stock PSU from the slimline or the PSU from newegg? Have you installed the driver for the GPU? I see no mention of driver installation.

I believe it is an RGB cable, thanks for the quick reply.

well from your links you provided the gpu shows 2 DVI ports and a S-video, so that might be a problem right there. Next, have you downloaded and installed the driver for that GPU?

Sorry, I'm a little new to the whole computer building deal, so you'll have to pardon my lack of knowledge in some areas, but I think the cable is actually a VGA, as that is what I've been plugging the cable into on both the motherboard and the graphics card (one of my friends misinformed me, I apologize). I'm using the PSU from newegg (COOLMAX V-400 400W ATX v2.01 Power Supply). I don't believe I've installed any drivers for the GPU.

Download the drivers from here....

AMD Catalyst

what type of monitor are you using?

I'll go ahead and download those then. My monitor is this: Westinghouse L1920NW Overview & Specs - LCD Monitors - CNET Reviews

I installed the drivers. No luck.

Seeing as the onboard video only has a VGA connection, I am assuming you are using a DVI-VGA adapter when connecting to the new card. If so try using the other DVI port on the card, as only one of the DVI ports supports VGA/analogue via adapter.

Alternatively seeing as that monitor also has a DVI port on it, you could use a DVI cable instead of a VGA cable.