So when I try to power on my PC, I get the "reboot and select proper boot device or insert boot media in selected boot device and press a key". I have only 1 hdd, and this is my 1th boot device in the bios. But sometimes it manages to boot properly and when it does it works fine, and if I reboot my PC it works as it should. I'm 99% sure that my hdd is the proplem, because it's pretty old and slow, but I don't have much experience so I want some to be sure what is the problem. Oh and when I don't shut down my PC, just take it to sleep mode instead, and after 9-10 hours when I try to wake it up, it's either restarts, or I get a blue screen and then it restarts. Sorry if my English is not the best, I hope you understand it.