On 30/06/2009, at 3:30 AM, Adam wrote:

> With increasing frequency, the computer shuts down without warning.
> The video goes, there is an audible "thunk," and the hard drive goes
> silent. It's definitely not just the video that's out.

Im not completely sure,

But could it be a harddrive problem? Seeing as later in the post, you  
say that using the optical drive brings the shutdown - the optical  
drive creates heat, and is directly below the harddrive. The  
harddrive may 'whine' quite loud when it is not running well, and  
then overheats, shutting down things without warning.

After it (iMac) shuts down, the harddrive cools, and eventually can  
be used again after it is cold.

Thanks,
Po-en Tsai

-- iMac G3 Indigo 350 MHz, running OSX 10.4, 10.3 and OS 9.2.2, 80gb  
HDD with 768MB ram. Quite speedy.





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