New gpu no display

Vividdd

Honorable
Oct 16, 2013
6
0
10,520
Hello guys I have posted on this amazing website once and it helped a lot. I have another problem Back in September for my birthday I got a new graphics card for my computer it was working fine the past few months and the fan on it just stopped working on it and it constantly overheats and crashes my computer I called the customer support and they said I wouldn't be able to get the new card because I lost the receipt so I recently installed my old graphics card and it was working fine until one morning I turned on my computer and it blue screened and it says "no source signal". the gpu I got for my birthday is Amd radeon 7700 Diamond and the card I have in my computer is the amd radeon 5570. PSU is thermaltake 500 watts. Please help.
 

Vividdd

Honorable
Oct 16, 2013
6
0
10,520

Hi my motherboard does not have a onboard gpu but right now I'm using the gpu that overheats and the psu is only 7 months old.