I got a PowerBook G4 17" 1,5 GHz last week.
I installed a SSD. Super fast, cool and silent.
Now I mention a silent zzzzshshhshhhpffffpfffzzzz noise when the power adapter is pluged in.
I can hear this noise when the PB is turned off with or without inserted battery.
On startup it dissappears and appears again when the OS has booted.
I could swear that this noise wasn't before. Its very silent, but I can hear it.
If you reduce the brighness there is another silent noise too.
The hardware check don't found anything.
Did you hear such noise on your PowerBooks
The DC-IN board?
So, I opened it and disconected as much parts I could.
No Speakers, no soundcard, no harddrive, no fans, no bluetooth, no memory.
This chirping noise comes from the logicboard! As soon as I plug in the power cord it is there.
(The PowerBook is turned off)
Are all PowerBooks (17") producing this electronic chirping noise?
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