[SheerGold]

I'm frequently getting the problem that:
Many times the screen goes grey and a message box appears telling me that I have to restart. Often this is preceded by the fans gradually increasing in speed until they are runing at maximum speed. BUT the fans behaving that way is NOT due to overheating. I have to use the restart button to make the Mac restart.

I have used reset button to reset the motherboard but that did not cure the problem.

Anyone have any ideas about how to cure this problem?

I'm running 10.4.9.
The mac is a dual 1.8 (June 2004). 1.5GB RAM, two SATA internal HD’s (Maxtor), two external firewire HD’s (Seagate). All the HD’s are less than a year old.

[Sherman Homan]

You are the proud owner of a kernel panic.
The cause can be anything from an incorrect permission to a dying motherboard. But most common, especially on your model, it is a bad ram chip. Do a search on this forum for kernel panic. Lots of knowledge here, and lots of opinions....!

[rehoot]

You might want to download a program to check all of the temperatures to see if it is a heat problem. Google this (with the quotes):

mac "temperature monitor"

There is a big post here for posting your CPU temperatures for comparison.

It sounds like your computer might need some hardware repairs.

[Big Mac]

When there's no fan control (due to a KP or the fan driver not being loaded), the fans automatically ramp up to full blast to protect the hardware. Go to Console (/Applications/Utilities/Console), click on the Panic Logs category and post a log here. We may be able to zero in on the problem.