Sizzle Sound and Random Crashes

Hi there
I have a Black Macbook (2gb RAM), and until recently haven't had any problems with it since I got it a month ago. In the last two days, things have changed. I've had two random crashes of the machine - no kernel panic, just a black screen needing a hard restart. Things seem to work fine after the restart. Today, I heard a sizzling sound periodically come from the speakers, as if it were trying to play a sound but had trouble. I try to replicate this by performing actions that might be making the sound (ichat signin/out, checking mail) but to no avail.
I wonder if any of the Mac sages here could point out some standard troubleshooting steps to clean things out before I call up Apple for advice. The only recent change was an update to 10.4.7.
Thanks in advance!

Hi there
I have a Black Macbook (2gb RAM), and until recently
haven't had any problems with it since I got it a
month ago. In the last two days, things have changed.
I've had two random crashes of the machine - no
kernel panic, just a black screen needing a hard
restart. Things seem to work fine after the restart.
Today, I heard a sizzling sound periodically come
from the speakers, as if it were trying to play a
sound but had trouble. I try to replicate this by
performing actions that might be making the sound
(ichat signin/out, checking mail) but to no avail.
I wonder if any of the Mac sages here could point out
some standard troubleshooting steps to clean things
out before I call up Apple for advice. The only
recent change was an update to 10.4.7.
Thanks in advance!
Applecare and a tech have diagnosed this as a faulty logic board, which I'm now waiting to be replaced. Sadness, but at least it wasn't the software.

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Sizzle Sound and Random Crashes

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