I have a pavilion a614n that doesn't boot properly. It goes past it's POST. When Windows attempts to load the bar under the Windows XP icon moves across the screen about four times then the monitor goes to sleep. There is no appearance that the computer shuts off. I see no error messages or blue screens. I tried swapping out the processor guessing that may be the problem, but had similar results. My next step will be to swap out the RAM, but I was wondering if anyone may have any other ideas that I may try.