Dual 2.7 Ghz PowerPC G5 Keeps going to sleep

My Dual 2.7 PowerMac G5 keeps going to sleep - particularly when working in power hungry programmes such as Aperture. In fact it is such a problem now that I really can't use Aperture since the machine goes to sleep every minute or so. (I can always wake it up by pushing the space bar.)
I've looked in Console and this is what it tells me:
Mar 21 16:20:45 mark-levesleys-power-mac-g5 /Applications/Aperture.app/Contents/MacOS/Aperture: CGImageCreate: invalid image provider: NULL.
Aperture(336,0x18c1800) malloc: * vm_allocate(size=283566080) failed (error code=3)
Aperture(336,0x18c1800) malloc: * error: can't allocate region
Aperture(336,0x18c1800) malloc: * set a breakpoint in szone_error to debug
Mar 21 16:20:45 mark-levesleys-power-mac-g5 /Applications/Aperture.app/Contents/MacOS/Aperture: CGImageCreate: invalid image provider: NULL.
Mar 21 16:20:51 mark-levesleys-power-mac-g5 /usr/sbin/AppleFileServer: AFPServer::AbnormalATListenerShutDown - clear listener
Mar 21 16:21:01 mark-levesleys-power-mac-g5 mDNSResponder: Repeated transitions for interface en1 (FE80:0000:0000:0000:0211:24FF:FE92:1761); delaying packets by 5 seconds
Mar 21 16:21:01 mark-levesleys-power-mac-g5 mDNSResponder: Repeated transitions for interface en0 (192.168.1.65); delaying packets by 5 seconds
Mar 21 16:21:02 mark-levesleys-power-mac-g5 mDNSResponder: Repeated transitions for interface lo0 (127.0.0.1); delaying packets by 5 seconds
Mar 21 16:21:02 mark-levesleys-power-mac-g5 webdavd[462]: stream_transaction: CFStreamError: domain 1, error 57
Aperture(336,0x18c1800) malloc: * vm_allocate(size=527798272) failed (error code=3)
Aperture(336,0x18c1800) malloc: * error: can't allocate region
Aperture(336,0x18c1800) malloc: * set a breakpoint in szone_error to debug
Mar 21 16:21:26 mark-levesleys-power-mac-g5 /Applications/Aperture.app/Contents/MacOS/Aperture: CGImageCreate: invalid image provider: NULL.
Mar 21 16:21:35 mark-levesleys-power-mac-g5 /usr/sbin/AppleFileServer: AFPServer::AbnormalATListenerShutDown - clear listener
Mar 21 16:21:45 mark-levesleys-power-mac-g5 mDNSResponder: Repeated transitions for interface en1 (FE80:0000:0000:0000:0211:24FF:FE92:1761); delaying packets by 5 seconds
Mar 21 16:21:45 mark-levesleys-power-mac-g5 mDNSResponder: Repeated transitions for interface en0 (192.168.1.65); delaying packets by 5 seconds
Mar 21 16:21:46 mark-levesleys-power-mac-g5 mDNSResponder: Repeated transitions for interface lo0 (127.0.0.1); delaying packets by 5 seconds
Mar 21 16:21:46 mark-levesleys-power-mac-g5 webdavd[486]: stream_transaction: CFStreamError: domain 1, error 57
Mar 21 16:21:50 mark-levesleys-power-mac-g5 mDNSResponder: Repeated transitions for interface en0 (192.168.1.65); delaying packets by 5 seconds
Mar 21 16:22:02 mark-levesleys-power-mac-g5 diskarbitrationd[41]: LaunchCFMApp [257]:22547 not responding.
I've probably pasted in too much there but I don't know what it all means. If anyone out there has any bright ideas, please let me know!
Thanks
Mark
PowerMac G5 2.7 Dual   Mac OS X (10.4.9)  

Hi The Hatter! Thanks so much for taking the time to answer my query. Unfortunately I've tried all your suggestions (apart from reinstalling 10.4.9) and nothing has worked.
Reset the PMU; zap pram/nvram from cold start; or,
from Open Firmware.
I zapped the PRAM but to no avail.
Never let drives sleep?
Yes this was set on 'Never let drives sleep' anyway.
Did you add any drives? Seagate?
I have a factory-added drive; the computer arrived from Apple with 2 400 Gb Hitachi HDS724040KLSA80 hard drives
any PCI cards?
None
Does it happen in SAFE MODE?
Yes it does.
Have you got any background tasks 3rd party to
monitor the system?
There's NetBarrier Monitor and VirusBarrier Monitor
What do you see when you boot in Verbose mode also?
What am I looking for here? The screen fills with all sorts of things but I have no idea what they mean!
Did you "use" your Mac when you updated to 10.4.9?
did you use the combo updater? might even want to
rerun that - after doing the old routine of "backup,
repair, run Disk Warrior" first. And run the update
in Safe Mode just to reduce background programs.
The problem was occurring in 10.4.8 as well - and may have even been happening before that, but has become worse in 10.4.9
PowerMac G5 2.7 Dual   Mac OS X (10.4.1)  

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