I HAVE A IBM THINKPAD 700 SERIES AND EVERYTIME I TURN ON THE LAPTOP THE SCREEN BLINKS AND TURNS BLACK AND I CANT SEE ANYTHING.WHAT MAY BE PROBLEM? CAN ANYONE HELP? ALSO I HAVE A LAPTOP IBM THINKPAD 600E AND I KEEP GETTING A MESSAGE POP UP SAYING I HAVE A REGISTRY PROBLEM.WHAT DOES THIS MEAN?