My custom built PC wont start, need help with a fix.

[FullHalfEmpty]

A brief description of what happens:
When I press the power button, everything lights up and all the fans spin but no video output is picked up on either of my (2) monitors. Both monitors detect a signal (ie. Allow me to select the option in the input menu) however there is no display. My main monitor acts like it will display, with the screen going black just like when it detects a signal, but doesnt and displays no signal.
Also, I can hear the GPU fan rev up and down, constantly (normally it would rev up untill windows loads and then rev down).

I would really appreciate any help from you guys. I have tried turning on and off, unplugging, and putting gpu back in, and booting with no video outputs connected to gpu but all has failed.

Thanks in advance!

PC specs:
AMD FX6300
EVGA GT 630
Windows 8.1
MSI 970 Gaming mobo

 

[DeathRabit]

Unplug GPU, check slot for any dust - clean it plug GPU back.

 

[sizzling]

Has it ever worked? If it has what was the last thing you did before it stopped working?

 

[FullHalfEmpty]

DeathRabit: I have unpluged and repluged the gpu but I never tried cleaning it, I will try that.

Sizzling: Yes it was working the Day before the problems started. I remember I was doing windows updates before the problem, The 'update and restart' option. I think I did that, then I did it again afterwards because it still said update but froze (or something similar) so I forced shut down the computer by holding power button. That was the last thiNg I did before the problems started.

 

[sizzling]

That's good information to know but unfortunately it didn't give me any ideas of what could be wrong. If you take out the GPU and plug a monitor into the igpu does it work?

Im beginning to think a dead GPU but without swapping it for another its hard to say for sure

 

[FullHalfEmpty]

My mobo doesnt have any video outputs and I dont think my cpu supported video anyway.
Is it likely that the GPU is dead despite the fan spinning on it?

 

[FullHalfEmpty]

I have just tried booting the computer and noticed that there is no light from my mouse, Im not sure what stage of startup it normally lit up at, but it isnt lighting now. I just thought this might help for ideas.