I have a problem with a Sony Vaio all in one desktop model number PCG-252L. Whenever I boot it up it briefly flashes the Sony logo for a second then quickly turns to black as if I turned the monitor off. The strange thing is that when I actually press the button to turn off the monitor then turn it back on it will post an image for a few seconds before going straight to black. Before this happened I was running Ubuntu and had no viruses to the best of my knowledge. What can I do to fix this?