brought this compaq bout 2 weeks ago second hand runnign windows vista. has been working fantastic since brought it am a student so ive ran out of money after going out and buying a whole heap of stuff for it now its stuffed. i was typing on word an essay when the screen went sort of fuzy and white and then stoped working but the speakers kept working for a few seconds then the screen went black and it restarted. now all it does is power up screen stays black everything lights up and when u touch the speaker butons ect they make the usual beep noise but after about 15seconds with nothng on the screen it shuts off asn starts again and just kepps doing it over and over. i have no more money and it had all my work on it now im stuffed please can someone help me