I recently purchased a refurbished Dell D800 online. I began having problems with the screen turning snowy, causing the unit to reboot. I sent it back to the seller, who sent me a replacement unit. This same unit had old drivers that had to be updated, but now I'm having the exact same problem. I'm hoping that this is a software issue, or a problem with settings. I did notice that display setting said something about "multiple monitors." Has anyone had this problem before? Please tell me this is an easy fix.