Razer Diamondback turning on and off

acually, your problem is windows updates, I am using vista, and I have a Razer Copeprhead, I had similar problems as you, my mouse was working fine, but an update for the Razer Auto-Installed from Windows Update, which made my mouse start doing it. First it happened on my computer, now it happened on my dad's laptop, I first assumed the internal connection was damaged, so I was beating my mouse to death....CoD4 with mouse failure = ANGRY RAMPAGE! lol. So yea what it is is you have to COMPLETELY uninstall your drivers, then connect the mouse and re-install drivers, there ya go done!

try to check the cable of the mouse... check the cable from behind the mouse to its end.. do you see any damage on it?? this ususally happens when the mouse cable is damage and you can't repair it.. all you have to do is purchase a new one..