[felbie]

My 15" G4 powerbook started making a weird consistent crackling noise. This is persisting now for a few hours and it has now started to make another noise in addition to that which resembles the steadiness of a siren but i can not describe the noise maybe like a low tone squealing, it is very odd. not extremely loud but loud enough to notice if you werent listening for it. Any ideas? has anybody heard of this? Thank You

[romeosc]

It sounds like you are getting an AC hum on your speaker. Try turning off speaker volume and see if it persists.

Sometimes when a capacitor is failing it will cause the speaker to squeak.

Does it sound like a CD drive or hard drive sticking? Feel any vibration?

[felbie]

I turned the volume down(completely off) the noise persisted, I unplugged the AC adapter and most of the noise vanished. no vibration or anything along those lines. there is still a consistent noise without the AC adapter though. What exactly does that indicate though, a bad adapter? Thank you for the help.

[romeosc]

Originally Posted by felbie 

I turned the volume down(completely off) the noise persisted, I unplugged the AC adapter and most of the noise vanished. no vibration or anything along those lines. there is still a consistent noise without the AC adapter though. What exactly does that indicate though, a bad adapter? Thank you for the help.

Try the following and see if you hear any differences:

1. Turning screen brightness down & back up

2. Insert a Cd and accesss

3. try loading a large file from Hard drive

[jamito]

Try changing your processor settings to automatic or lowest.