My computer has developed a strange startup problem. It has been running fine for several years. Now when I turn it on the monitor does not get a signal and there is no post sound. It just sits. If I turn it off and then right back on it starts up just fine and and it works just like it always has. Occasionally it will also just sit there after the RAM check but that only happens about 5% of the time. The fix for that is to just turn it off and on again. Does anyone have any ideas as to what the problem could be?