Why is my graphics card not displaying output to my monitor

I have a gtx 650 I've tried to take it out clean it everything I'm too poor to buy a new one and just want to work with what I have but for some reason my pc will either say no display when my monitor is plugged into my graphics card or it boots up and after like 5 min it's shuts off and the fan starts spinning very fast pls help idk WHT to do