I have a Mac G4 running Jaguar. I have been having some problems where my mouse and keyboard power off. After un-plugging and plugging them into the USB port, they power-up again. This happens quite often. this machine had been working flawlessly until i upgraded RAM memory a couple of weeks ago. But even after the upgrade, the machine was working ok. could the RAM (Bought at Compusa) be the problem? Should I had bought RAM at Apple? Any ideas?