Intel iMac freezes

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Joined: Aug 6 2008
Posts: 1

Hello,

I've got an Intel Core Duo iMac running OS 10.4.11 which freezes on me sometimes. The only solution is to turn the machine off. It seems to happen randomly--not while in any particular application. The machine came with two 512mb sticks of RAM. I took the machine to the Apple service agent, but it did not freeze while he had it. He suggested new RAM, so I bought a single 1GB stick of RAM to replace the two 512mb sticks. With only the new 1GB stick installed, the problem persisted. I called in another tech over to my house who ran DiskWarrior which found no problems, and the tech could not determine the source of the problem, but thought that there might be a conflict in a software update or something. We did a reinstall of the system, but still the problems happens. In addition to the freezes, it sometimes goes black like it's gone to sleep, but doesn't wake up and has to be restarted. On a couple of recent occasions while booting up, after the sprocket, it goes to the blue screen and freezes at the blue screen. Any suggestions? Does this sound like a hardware or software problem? Would upgrading to Leopard be a solution, or could that compound the problem?

Thanks ahead for your input!

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ibub's picture
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Joined: Mar 26 2008
Posts: 7
Heat or clean (?)

You didn't specify, but does the problem take longer to occur if you let the machine set overnight, de-energized? Also, have you looked at component Temps via iStat or one of the other monitoring widgets that are readily available for Tiger? Really sounds like component related, which heat aggravates. How comfortable are you with popping it open for a good visual and smell check for overheating? Good opportunity to clean it (carefully) as well.
LCD iMacs are the worst at tolerating a coating of dust and/or grime, but I've fixed G3/G4 and one G5 MacPro's with problems similar to your description after disassembling, cleaning, re-seating boards/ram/etc with no obvious sign of where the problem had been but it didn't come back either. Good Luck...

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ibub