One moring I woke up and my pc was stuck on the loading screen, I turned it off and back on and it constantly will not get pass the "starting windows" screen. I've tried safe mode (f8), and the repair mode. I took it into the shop becuase I was also having blue screening issues, (but it was because my RAM card was out of place. But is fixed now.) I ended up replacing my power supply, and the first time it turned on, it worked. But as soon as it restarted I was back at the beginning. What can I do?