My kitty has a habit of walking on my keyboard, and hits some button or combo of buttons; and the screen goes black! Drives me nuts cause I don't know what he's hitting, and wiggling the mouse around doesn't do anything; I have to reboot my comp everytime. I have a desktop HP pavilion a1720n, with the vista operating system. Anyone have any clue what button or combo of buttons he could be hitting to cause this? Thanks in advance!