Strange noise at startup

When I turn on my iMacG4 I get a weak, scratchy sound instead of the usual, cheerful "boyng!" Also, when I play a dvd, or use itunes, the sound is dreadful. Should I take my computer to a doctor??

In my experience I'd say your hard drive is about to
fail. Back up as much as you can. You may only have
one more boot left in the computer.
Sorry to out and out refute your claim, but no. That's not it at all. For two reasons:
1) Startup sound is stored in firmware. If there was a problem with the firmware severe enough to corrupt the startup sound, the computer wouldn't boot.
2) The computer would be having far more troubles than just sound if the hard drive was failing.
The real cause of the problem would be your sound setup. Try a different pair of speakers. If it's still crackly, then your sound card would be at fault. If this is indeed the case (you've tried another set of speakers and they still crackle) then you might want to consider a USB audio card.
I can pretty much guarantee your hard drive isn't failing. If it is, it's completely coincidental, and not related to your current issue.

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