My HP froze up about 18 months ago with the caps lock light on and the f11, f12 keys all lit up and a black screen. I have been playing with it lately and brought it back to life yesterday by doing some suggested hard reboots and having a disc in the dvd drive. it worked all day yesterday and now is going back to the same actions. It seems to overheat a bit but not real bad and it has shut down on its own a few times. Is the power supply going on this machine and is it something I can repair?