A couple of days ago, my monitor started turning on and off whenever I turn the pc on. It sometimes happens when the pc wakes up from sleep mode too. The monitor gets in a loop of showing image for half a second, then 3 seconds of black screen. I can briefly see that Windows loads everytime, because I can see the desktop during the brief time it flashes. So far I can only "fix" it by rebooting a couple times, then it works flawlessly.