I have a used Dell Latitude D810 that was not wanting to shut down with XP Pro. I pressed the power button to manually turn it off, then it was hanging before loading Windows. I had an Ubuntu CD and ran Memtest86. It immediately found 5 errors. I am not sure how to interpret these findings. I still have a warranty at Ebay through the seller. Any guidance would be appreciated. BTW, I am running Ubuntu on a live session from the CD. Maybe this is my computer telling me it wants to run Ubuntu.