Windows 7 - screen black after login

Hi,

I am currently running into an issue with my computer and I can't seem to figure out what it is. Once I login and my desktop loads, everything is fine and I can go on the internet etc. 5~ minutes later the screen goes black. I notice my computer is way more quiet than usual. This began this morning. I've concluded its not the monitor because I have a dual monitor set up and both aren't working. My fans are still running etc so I'm not sure if that rules out the power supply. I tried to plug one of my monitors in to the on-board slot (using NVIDIA GTX 460) and that didn't work, but I haven't switched the display in the BIOS yet to confirm that. Ok as I'm typing this I just realized the fan on the GTX isn't working. Is this a sure sign that it's done for, or is there still hope?

TLDR:
-Black screen 5 mins after login (both monitors)
-Computer unusually quiet (just hum from fans)
-Video Card fan isn't working.
-Is the card done for?

Thanks!
 
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