iMac freezes after multiple apps open/long inactivity

AlgaeNymph

Registered
Computer* freezes after one of:

• Hours of inactivity with only screen, but not computer, asleep.

• Programs opening right after hard restart.

• Specific program, likely with high memory requirements, starts.

It prevents me from opening new programs and restarting the computer, as well as stalls a program I'm on, particularly when I switch between them. This happens most often when I'm starting Thunderbird, browsing Firefox, or reading Acrobat Reader or Word documents. I checked and the problem is not unique to the aforementioned Mozilla programs. Furthermore, it started when I downloaded the StarCraft 2 beta, and downloading updates also causes the stalling half the time.

I had my hardware checked out by Eaton and Associates of San Francisco, suspecting a fan problem. There was no software problems, a lot of dust, and I had my fan replaced anyway. It's gotten a little better but the crashes still happen. I now suspect it may be the power supply that needs replacing.

Does anyone know what is wrong with my computer?


* Specs below, please let me know what else you need.

Model Name: iMac
Model Identifier: iMac8,1
Processor Name: Intel Core 2 Duo
Processor Speed: 3.06 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 6 MB
Memory: 4 GB 800 MHz DDR2 SDRAM
Bus Speed: 1.07 GHz
Boot ROM Version: IM81.00C1.B00
SMC Version (system): 1.30f1
System Version: Mac OS X 10.6.7 (10J869)
Kernel Version: Darwin 10.7.0
 
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