Babe 714, Sounds like the transformer is going...happens over the years or time from constant turning on and off...sudden rush of voltage causes copper insulation on windings to breakdown....suggest if you can't buy a new one right now, because repair would cost just as much as a new one...just leave it on all the time...use screen saver...or else turn down brightness if your shutting down cpu...make sure your using a surge protector strip with fuse.