What seeing is a POST Failure. During the very initial up sequence, the computer does a Power On Self-Test (POST) — this includes testing the video, basic memory functionality, and other necessary-to-boot quick tests.
Generally speaking, your hard drive with all of your data will be 100% as-is — unaffected by the current failure.
My best advice for you is that if you know too much about computers and their hardware, is to take it to a reputable local computer repair shop. Sometimes it can be as simple as re-seating RAM, other times, it can be a lot more complex — in any case, you want to be reaching in there without being grounded, otherwise, you run the chance of out a of the computer.
