So I've been dealing with this issue for a while. I can run just fine in safe mode, but when I try to login normally, its okay for a few seconds, and then it restarts with no error. Or, when I hit the windows button in the lower left, it will restart immediately. I have replaced almost every part in the computer, except the harddrive but they have been through tests at a shop I took it to. Im running a z390 MSI Gaming Plus motherboard and a i7 9700k. All parts in the PC are compatible. Not sure what is causing this. Please help!