My desktop computer has been having problems, and everytime I turn on my computer, everything is fine, until it reaches the login screen. At that point, my monitor blacks out, the light of my monitor changes color, and it says that there's no signal. However, on safe mode, there are no problems and the screen will never black out as far as I know. So far, I've scanned with various scanners (Panda Security online scanner, BitDefender online scanner, TrendMicro's sysclean and online scanner) and nothing has come up. Any ideas?