I have a problem that has me baffled...and frustrated. My mouse turns off and on by itself. The cursor stops moving, I hear the WinXP, "Bedunk" and then I'll hear it one more time and the mouse will turn back on. It is very annoying while browsing but absolutely maddening while gaming. I am using a Logitech USBOptical mouse model G500. I have tried two other optical mice. I have tried switching USB ports, every USB port I have! I removed the mouse drivers and tried the WinXP drivers. I tried removing the drivers and reloading Logitechs latest drivers. I updated the motherboard drivers. I updated every driver on my system! I have a Card reader/USB port that I thought might be conflicting so I disconnected it...No Go. What can I try next? Can I prove somehow whether this is a software issue or hardware issue?