Was your machine having issues such as freezing, crash or sometimes straight-up not POSTing before you added the fans, that is a sign of a dying motherboard or bad RAM. Try with one stick in the motherboard and see if it POSTs, if it does then try every stick of RAM to pinpoint the bad RAM stick. if it does not that could mean maybe a bad CPU. Do you have another CPU you could try to put in the motherboard?