Question Pc displays a mix of blue screens then works once, then more blue screens. Help!

Dec 28, 2019
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Now I'm not nails at computing and tech like yous so I apologise befor hand..
My pc keeps showing a multitude of different blue screens every time I switch it on., and this last for hours untill it randomly works once then its back to more of the same. Also there is grinding kind of sound like the hdd is trying to read so that's why I thought it might be the drive/s. But the reason for all this is my cat was sleeping on the tower, and while I had the side off her back legs slipped off and went I to the case. I have checked all wires and things and the only thing broke was one pin that connects one cpu fan to a power cable. The fan still works. Please help.
Ray