Hello everyone A friend of mine's Mac Pro (2008 3.1) is making a weird clicking noise intermittently. To me, they sound like the kind of clicks that static electricity makes and they're quite quick....About 3 or 4 per second. There doesn't seem to be any trigger or thing you can do to make it start...It just happens randomly and goes on for anything up to 20 minutes or until the machine is shut down and restarted. It seems like the noise is coming from the power supply. We've tried resetting the SMC but that made no difference. Does anybody know what this might be? I suspect his power supply is on the way out, but don't want to recommend he replace it unless I can be sure that's what it is. On the other hand, I'm weary about the issue getting worse and potentially damaging his Logic board. Thanks for any help or suggestions.