How to disable safe Mode on Dell Microsoft 8? I’m guessing this is my problem. I accidentally interrupted the factory reset and my computer turned off. Now when I power it on it says that it’s Preparing Automatic Repair then it says Diagnosing Pc. After that the screen turns black and restarts that process over again. I was able to hit F12 and I performed a system test. Everything came back normal but once I exit out of that screen it just continues trying to reboot, but doesn’t. Please help!!!