G5 Freezing and/or Fans going into hyperdrive

One of the machines in my editing lab has suddnely been totally freezing (needing to be rebooted) and also the fans have been kicking in as if it were about to take off. This happens simultaneaously or sometimes independently of each other...a forced reboot is the only thing that helps temporarily. Is this a hardware issue?
G5 - Dual 2 GHZ - 1GB Ram - OS 10.4.8
Thanks,
Jeremy

Jeremy,
I get the same problem every few months. I just posted to this forum about this. If I get a reply I'll let you know. If you have found a way to resolve or correct this will you let me know?
Thanks,
ds
[email protected]
G5 dual quad   Mac OS X (10.4.8)  

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