Have a 2005 Compaq Desktop computer with P4 processor running Windows XP PRO. I am a fulltime RV'er currently spending the winter in Florida. I have encountered a problem which occurs when the computer is off for several days when we travel. When turning the computer on after it has been off, I get distorted graphics at the post and windows welcome screen, consisting of black vertical bars and "smears" when the mouse is moved. The first time this happened, I was able to eventually get it to operate correctly after repeated re-boots. Now I have returned after being away five days and the problem has reoccurred, only this time the computer freezes at the Compaq welcome screen, and only a portion of the graphic is visible behind the garbage running on the screen. I am not able to get into Windows, Safe Mode, or access anything using F1, F2, F8 or F10 commands. I have checked and cleaned CPU fan, etc. I do NOT have the original Windows disk as Compaq only provides a "reinstall drivers" CD. Is this a hardware problem or a software problem? Any input is greatly appreciated!