Ok so I recently upgraded to windows 10 about a day ago and havent had any problems. Today I decided to change my powersupply to the new one I just bought. The powersupply wasnt working properly at first doing things like only one cpu fan turns on and the cpufan light doesnt turn on. I wanted to test to make sure everything was working fine before I close up my system so I did a test with everything plugged in including harddrives. When i turn the pc on I am not getting a message saying "NTLDR is missing". I read its something about the boot drive but I dont know how to solve the problem. I removed that powersupply and plugged in my old one that works perfectly fine and still get the message obviously. Could this be because of upgrading to windows 10 or maybe because started up the computer without a harddrive plugged in or maybe the powersupply somehow messed up my harddrive. Please any help thanks.