Question Faulty Graphics card?

[JayChenoweth]

Ok so recently my computer has started doing this thing where when I attempt to boot the CPU led lights up white for a split second and then about 2 seconds later the white VGA light comes on and stays on solid white with no signal on my main monitor and a black screen on the second one. The GPU is under warranty so I can return it and get my money back (it was second hand) but I just want to make sure it's definitely a GPU problem and not a mobo problem. This never happened before and only just started happening in the last week, I unplugged and replugged everything and it still kept happening. Also when the white VGA led comes on the fans stop spinning on the GPU. I haven't seen many people with this similar issue and I just want to be certain before I spend £200+ on another one. Can anyone help?
Cheers,
Jay.

 

[popatim]

Why would you spend on another one, you just said you can return this one.