If my mac goes idle or asleep it won't come back up

I posted this problem (below) on Monday and have reset the pram and the SMU by unplugging from the wall, as yet have not opened her up. Working with her all week the problem only occurs when she is idle, she goes to sleep and will not come back up. I put her into sleep mode myself and tried to bring her back straight away even before the fans got loud but she would not come back. So it now seems that my main problem is if the mac is idle it will not come back up without a retstart.
Been in touch with a support place who say the hard disc is failing and it needs a new hard disc, reluctant to do that but it now looks it may be the time to update.
Anyone else come across this I bought this Mac in 2005 and am told I may get £100 quid for it!
My spec is 2.3GHz Power PC G5 Mac OSX Vers 10.4.11. 4.5 GB RAM
Over the weekend I got back from a weeks holiday and powered up my Mac. On three occasions yesterday while it was left alone or in sleep mode the fans went very loud and the screen would not come back up.
The only way to stop the fans was to hold in the start button for several seconds until it powered down and restart it up again.

Disks are easy enough to have directory need repair or replace if really can't be fixed by just Disk Utility or reformatting.
I don't know that you want a "support place" though.
And for future: there is a forum for G5s.
https://discussions.apple.com/community/desktop_computers/power_mac?view=discuss ions
SMU Reset of G5 is not just from unplugging - that is for later INTEL based Mac Pro, not PowerMac.
Read this article:
http://support.apple.com/kb/HT1436
To resolve your issue, try to eliminate and unplug any devices, cables, etc.
Try a clean OS
Right now though your disk drive directory - boot from another hard drive with OS X, or boot into Single User Mode and run fsck. Or of course if you own Disk Warrior, use that.

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A Brody,
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Hello,
From the news page here...
http://xlr8yourmac.com/
See if it's related to this...
It also seems to be related to later OSX versions, like 10.8.x & 10.9.x
The 2012 macs (and later apparently) (also later OSX versions on earlier Macs can do it also), not waking normally from sleep after hours being in sleep. (noted here ...
http://www.xlr8yourmac.com/archives/feb13/022813.html#2012macswontwake
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The sleepimage file still reappears even if never slept. Delete it (hibernate off, etc) - within minutes its back.
A note on that here - http://www.xlr8yourmac.com/feedback/Chameleon_SSD_Optimizer.html
About iMac sleep...
http://forums.macrumors.com/showthread.php?t=1529750
Try this: "sudo pmset autopoweroff 0" and "sudo pmset standby 0"
http://xlr8yourmac.com/archives/sep13/091313.html#10.8.5SleepEjectTip
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If my mac goes idle or asleep it won't come back up

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