My future mother-in-laws laptop kept locking up and shutting down on her after about 6-7 months of owning the unit. She sent it back to Compaq because it was still under warranty and the service report indicated that they had reset the memory and did a BIOS check and that it was tested as working. Shortly after that, the same issue started again. It is still not repaired and the warranty is up. I have already run the System Recovery disk and checked the memory. The fans are all working nad the unit does not appear to be overheating. It has stopped the random shut downs, but now it will lock up and the screen will become a mess of jagged lines and distorted imagery. I am thinking of either the board or the memory needing to be replaced at this point.