My parents/younger brother had messed up the family computer with viruses and stuff and even after running multiple virus scans and spyware removers it still had pop-ups and random crashes. So I decided just to do a factory restore to return it to its original factory settings. After doing so I deleted some of the useless programs that are initially installed with the computer and turned it off. The next day I tried to turn it on, and the power sign would flash and lights would turn on, then it would shut off, and automatically begin the process over every 5-10 seconds. During this time the monitor shows the "no signal" sign. Any ideas what could of gone wrong and how to fix this problem?