I am having a problem with an older model PC. I was adding new ram and everything was working well. PC loaded and everything was up and running. Was updating some files and rebooted PC. At that point PC would not come on. The light on MOBO was on and CPU fan would do about 3 turns then stop and nothing else would happen. Nothing running at all except light on MOBO is still on. Tried again, but unless I removed power cable and then plugged it back in, the CPU fan would not even do the 3 turn, nothing. Have tried disconnect on/off switch and jumping with screwdriver and only does same. Also, had another PC that I cleaned and upgraded ram. It was running fine until took it to desk to setup then it would not come, seems like same problem. Any ideas what I may have done wrong?