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If the crashes are particularly random, I would look at replacing the memory first when it comes to hardware. Also, make sure that you have at least 2 GB of memory if not 4 for that computer. The next piece of metal to look at replacing would be the hard drive, particularly if it is making any strange sounds. I'm not sure why a the video card and power supply would be replaced for intermittent crashing unless there were some other symptoms that were eliminated. It would be interesting to see the work order on this one.<br />
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It it is a software problem, there are many steps to take to isolate the problem. These steps are well documented, so I won't try a brain dump here.<br />
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How much memory do you have and which OS are you running. Any special software that you are running?
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Step 1- Make sure you have a good backup, intermittent lock-ups may indicate imminent, catastrophic drive failure
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I'm running OS X 10.6.4 /w 2 GB 800 MHz DDR2 SDRAM. I have stress tested the memory for a good 3 hours the other day, made about 7 passes without any quantifiable abnormalities. I believe I ruled out a software issue by reinstalling the OS.<br />
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Not sure if I am allowed to upload pdf's, but here is a scan of the work order. Not really much information there. He didn't give me any info when he gave it back. Only told me that it was ready to be picked up. I have copies of the kernel crashes, if you'd like to take a look. So far I've only saved three however.<br />
<a href="https://filedb.experts-exchange.com/incoming/2010/11_w46/368463/scan.pdf" target="_blank" class="file-inline" title="Apple Store (881 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>scan.pdf</a>
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scan.pdf

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Losing the drive is not a problem. This computer is used as a remote terminal with a few local tasks. Word processing, internet, email, calendars, and such.
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That was actually one of the first pages I read and tried before reinstalling the OS. One of the first searched in goole too. Thank you. (:
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Download and install the freeware SmartReporter: &nbsp;<a href="http://www.corecode.at/smartreporter/" rel="ugc">http://www.corecode.at/smartreporter/</a><br />
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It checks your drive hourly for hardware problems.<br />

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I have an iMac that seems to panic at random and just turn off. I've reinstalled the OS. Took it to the shop and they've replaced the following:<br />
<br />
661-4670 &nbsp;Power Supply, 180W<br />
661-4673 &nbsp;Card, Video, ATI Radeon HD 2400XT<br />
922-8188 &nbsp;Cable, DC, Power Supply/SATA/Inverter<br />
<br />
I'm still getting random crashing. I've ran a file system check (fsck -fy) twice. Would you guys know of anything else I should try?
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I have an iMac that seems to panic at random and just turn off. I've reinstalled the OS. Took it to the shop and they've replaced the following:

661-4670  Power Supply, 180W
661-4673  Card, Video, ATI Radeon HD 2400XT
922-8188  Cable, DC, Power Supply/SATA/Inverter

I'm still getting random crashing. I've ran a file system check (fsck -fy) twice. Would you guys know of anything else I should try?

iMac Sporadic Crashing

Mac OS X is the desktop operating system from Apple Inc., found on Macintosh computers. OS X consists of a Mach/BSD-based kernel, operating system interfaces primarily based on FreeBSD and additional frameworks (written in C, C++ and Objective-C providing user interface and application-level services.

Mac OS X

Components are those devices that are internal to a computer -- the PC boards, the central processor (CPU), the memory (RAM), disk and video controllers and so on.