[ulmer]

Others have noticed this and thought it was the hard drive making the light beeping and buzzing noises on this machine. After, getting a G5 Powermac at work. I experimented with the CHUD tools (disable nap mode) fix for it which worked great on the Powermac. I got curious and tried it on the Powerbook 15" Al and it worked. Noises are gone. I'm not sure if this is old news but I haven't seen it anywhere. Apple apparently recommends you don't do this on a Powermac but no one has been able to determine a reason it might hurt. On the Powerbook it would likely reduce battery life but the noise is worse plugged in and if you find yourself in a noisy environment and where you don't mind decreased battery life or you're plugged in, this might be just the trick. Pretty annoying this seems to be a "feature" of new machines now. Apple claims it's the Powermac power supply and has replaced some but user reports indicate this hasn't solved the problem.

Here's a link:

xlr8yourmac G5 beeping fix

Hope is is of use,
Brian

[RBM]

Disabling the NAP mode has one side effect though: it makes your fan turn on quickly, and it keeps turning on/off afterwards.

Result: more noise than the slight sizzle, with loss of battery life as added bonus. No thanks.

[ulmer]

Hmm, I didn't use it for more than 10 minutes this morning. That's too bad if the fan is going to be running all the time...

Any word on what NAP mode actually does? Does it have to do with reduced processer speed support?

Thanks,
Brian