Re: Safe Mode Startup
You could also be overheating. Check for dust buildup on the fans. If it is caked on pretty bad that may be your issue. It is fairly simple to pull the cover, disconnect the power cord, keep one hand on the metal frame of the box, and use a vacuum to remove all of the dust.
Be very careful, if you don't make sure you are grounded to the frame you risk building up a static charge and frying your boards.
Nate