Power Mac Quad fans going into overdrive

Hi,
I've been experiencing some strange issues with my Power Mac Quad G5 recently. The issue seems to coincide when I'm running either one of the three listed programs (FLV2 iTunes, Handbrake or Reel Bean) when they are compressing or converting files. On a couple of occasions when i've left the programs running over a period of time i've come back to find the fans in complete overdrive mode, the screen black and the computer completely unresponsive to any key commands. I have to hold the power button in for 5-6 seconds to shut it off. It re-starts normally and runs fine. Any help would be greatly received.
Thanks

Hardware monitor is the application that will monitor temps & other stuff (CPU voltages, fan speeds) http://www.bresink.de/osx/HardwareMonitor.html. I used it on my dying G5, the data always ended abruptly when the crash happened.
I think your G5 is doing the same as many others, namely crashing while asleep, then the fans go up to 100% I'd strongly recommend you disable sleep and see if it happens again. My 3 year, 2 month old G5 became useless after one of these 'sleep crashes', I think it is possible for the hardware to become damaged during one of the events, or it is the reason for the 'sleep crash'.
There are lots of threads on 'fans on full blast', 'turbo fans', 'jet fans', 'sleep jet fans'… in the G5 forums, I haven't seen one that has an answer to solve it, but consider stop using sleep & keep an eye on the number of CPU's the G5 boots with, lots of G5's have lost CPU's and I suspect this is part of the issue.
http://discussions.apple.com/message.jspa?messageID=8391812
Good luck & tell Applecare about it if you are covered.

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Ah, this is why one should not post late at night with little sleep. Thank you all for the answers and kind responses of help.
Very good suggestion to reinstall the system and I shall do so. I believe this is the MacPro forum, is it not? Should I still repost? I used everymac.com to determine my system BUT posted the results incorrectly (corrected below and yes, it is a 2006). My apologies. I ran the software that THE HATTER suggested and have the results below. I'm not opposed to spending money to either upgrade or purchase a new(er) machine-- simply looking to spend the money necessary wisely for the best possible return. Thank you again for the help.
ETRECHECK:
(I'm only posting part of this-- I don't know if there's a posting limit or protocol on posting). I am running CS5
Hardware Information: ℹ️
Mac Pro (Verified)
Mac Pro - model: MacPro1,1
2 2.66 GHz Dual-Core Intel Xeon CPU: 4-core
6 GB RAM
DIMM Riser A/DIMM 1
2 GB DDR2 FB-DIMM 667 MHz ok
DIMM Riser A/DIMM 2
2 GB DDR2 FB-DIMM 667 MHz ok
DIMM Riser B/DIMM 1
512 MB DDR2 FB-DIMM 667 MHz ok
DIMM Riser B/DIMM 2
512 MB DDR2 FB-DIMM 667 MHz ok
DIMM Riser A/DIMM 3
512 MB DDR2 FB-DIMM 667 MHz ok
DIMM Riser A/DIMM 4
512 MB DDR2 FB-DIMM 667 MHz ok
DIMM Riser B/DIMM 3
empty empty empty empty
DIMM Riser B/DIMM 4
empty empty empty empty
Bluetooth: Old - Handoff/Airdrop2 not supported
Video Information: ℹ️
ATY,RadeonX1900 - VRAM: 512 MB
VX2336 SERIES 1920 x 1080 @ 60 Hz
hp f1703 1280 x 960 @ 75 Hz
System Software: ℹ️
Mac OS X 10.6.8 (10K549) - Uptime: 89 days 2:15:37
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WDC WD2500AAJS-41RYA0 disk0 : (232.89 GB)
- (disk0s1) <not mounted> : 210 MB
Macintosh HD (disk0s2) / : 249.72 GB (18.35 GB free)
Hitachi HDT725050VLA360 disk2 : (465.76 GB)
- (disk2s1) <not mounted> : 210 MB
500GB (disk2s2) /Volumes/500GB : 499.76 GB (92.11 GB free)
WDC WD1002FAEX-00Z3A0 disk1 : (931.51 GB)
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Feb 18 08:16:32 LeoComputer kernel[0]: AFPSleepWakeHandler: going to sleep
Feb 18 08:16:32 LeoComputer kernel[0]: AFP_TCP ASP_TCP SendSleepPkt: sending ext sleep
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Feb 18 08:19:22 LeoComputer launchd: Server 0 in bootstrap 1103 uid 0: "/usr/sbin/lookupd"[227]: exited abnormally: Hangup
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[email protected]
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