Graphics Card Problems

[lflowers]

Hi all, my friend has been having a few problems with his graphics card not being recognized. His PC would boot up fine one day and then the next it will boot up but there will be no display. He has cleaned it out and checked to make sure everything is plugged in. He has also said recently it has been taking longer to boot up.
His PC specs are:
Intel core i5 3570k
Gigabyte Z77-D3H
16GB Corsair Vengeance low profile 1600Mhz ram
MSI 560ti 1024mb
240GB Corsair Force 3 SSD
500gb Mechanical HDD
Ezcool 700w PSU

Any ideas whats wrong with it?
Thanks

 

[lflowers]

Thanks for the reply J.D, i have already tried my card in his machine and it wouldn't recognize it was there. Once we had done this though, we put his card back in and worked fine but then a couple of days later the same problem occurred of it not being recognized. I thought it may be a PSU problem as i have never heard of Ezcool and it is 6 years old. Any ideas?