Lock up, fans go into high speed on dual g5

I am new on this forum so bear with me. I have a question for anyone here who can answer it.
I recently purchased a new powermac g5 dualcore 2.3mhz running 10.4.6. A few nights past I was on the internet and for some reason the machine locked up, this happened when I was answering a question someone on e-bay has sent me regarding an auction. I hit the command and escape keys and the machine's fans went into a high mode. I was concerned thinking it might be due to overheating so I had to cut power to the machine. I rebooted after a while and ran the disc utility. The disc checked out and everything appears to be normal.
Does anyone here have any idea what occured? Is it a cause for concern? I use a Apple USB dial up modem by the way. I realize it is positively neolithic but I intend to eventually go with DSL just haven't gotten it done yet. Thanks

Hi Studio,
Welcome to discussions.
Alfredo's experience aside, one anomalous event wouldn't cause me to worry about my logic board. In this case, where what you were doing was simple enough to be unlikely to have directly caused a problem, I don't think I'd worry at all. If the event happens a second or third time, I would go looking for it.
Fans: Normal behavior in any case where the temperature sensors' software isn't running. The only safe thing to do if the temp can't be monitored is to run the fans at full speed. The fan noise was a byproduct of the crash, not a sign that the powermac was too hot.
Good luck; let us know if you have a repeat problem...
John

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Problem description:
iMac 5K
The computer is running unusually slowly although it is not experiencing high CPU utilization.
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Report generated 30. März 2015 07:32:40 MESZ
Download EtreCheck from http://etresoft.com/etrecheck
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    iMac - model: iMac15,1
    1 4 GHz Intel Core i7 CPU: 4-core
    32 GB RAM Upgradeable
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        BANK 1/DIMM0
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        BANK 1/DIMM1
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        iMac spdisplays_5120x2880Retina
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↙-----------How do I give Kudos?| How do I mark a post as Solved? ----------------↓

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View Solution.

Hello DTCothren,
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Lock up, fans go into high speed on dual g5

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