> I can confirm the PSU noise problem - my machine beeps/chirps under > any > of the following conditions: > a) Graphics card use, esp. with OpenGL > b) Copying files over a network > c) Opening a file in Quicktime player > > After installing the CHUD tools (Apple, Developer software), > disabling > "CPU Napping" (some sort of power-down mode during idle clock cycles) > makes the chirping go away COMPLETELY and instantly. i just ordered a 2nd generation dual g5 (2.5), does this issue still affect the second generation machines? cheers, paul pounce international / marsh keyboard forum moderator http://marsh.prosoundweb.com/