I'm not really sure if this is a software or hardware problem. In the last few weeks I've found that sometimes when I take my computer out of sleep mode, the screen stays blank. The only thing on the screen is my tv's 'no signal found' message. When I go to press the reset or power button it restarts instantly (whereas if it was working and the screen just having a bad connection, I would have had to hold the power button down for a few seconds first). When it is restarting I have to delete the restoration point before it can continue properly. What could be causing this? My theory is a memory problem, but I want to check with others before I go out and spend lots of money on parts.