Weird noise from CPU

A few nights ago I awoke to hear my P-book G4 making a loud crackling noise so I freaked out and shut it down. After restart the next day it booted fine and then just booted up to a blue screen. I Waited until today and I tried to reboot off of the startup disk, and it spit that out and then all of a sudden it restarted normally but made those crackling noises again. THe noises have now stopped and I am running disk utility on it to see if that helps but does anyone know anything about this issue and if so could I have some help. Thanks

Denny: Replace your hard drive. The optical drive can't possibly make crackling or grinding noises without a disc in it, and it can't slow the operation of the computer to a crawl or prevent a normal startup from the hard drive. A failing hard drive would account for all the symptoms you've experienced, including the awful noises. Replacing the HD is easy; instructions for doing so are right in your Powerbook owner's manual.
I hope all your data is backed up, because any grinding noises you've been hearing could have been the read-write heads in your hard drive plowing furrows into the surface of the platter where your data used to be. You'll be very, very lucky if you're able to recover everything important from that drive. The more you try to use it, the smaller your chances of salvaging anything from it will become.

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