Power Mac G4 sleep mode issue using 10.5.8

Hello All,
If this is posted in the wrong discussion room, let me know.
I have a problem and I am not sure what to do at this point. For reference to understand the problem, I have a Power Mac G4 Dual 1.25Ghz MDD 2003(No FW 800) with an Apple Cinema Display. I also have a USB 2.0/FW 400 PCI card installed. I use this card to connect my external HD's.
The problem I am having is that the machine does not fall asleep properly using Leopard. When I manually put the computer to sleep, the monitor and external HD's shut off, but the fan stays on. When I try to wake the computer by hitting keys on the keyboard or moving the mouse, the computer will not wake the monitor or the External HD's. Furthermore, it freezes the computer when it is in the mode and the only way for the computer to function again is if I restart.
Until a month ago, I was running Tiger, 10.4.11, on my machine and had absolutely no problems with sleeping my Mac. I decided to go to Leopard, 10.5.8, and used the clean install option. I then used migration assistant to grab all my data and settings from a backup using Carbon Copy Cloner.
Using 10.4.11, I would usually let the computer sleep after 15 minutes of idling. Now, under 10.5.8, the computer freezes after the sleep mode is attempted.
At first I assumed that the computer was preparing itself to sleep and might take a while. I decided to wait it out to see if the computer would eventually fall asleep. I waited an hour but the computer maintained the same status with the fans blowing and the front power button light staying lit. And, of course, the keyboard and monitor were not responding.
I read some forum discussions that suggested to people with similar problems to consider removing anything connected to the PCI card. It was suggested that the HD's were keeping the computer awake. I tried removing each HD one at a time to see if it was a particular HD causing the problem. With each configuration that I tried to put the computer to sleep, the same result occurred.
At this point, I am at a loss. I love my PowerMac and don't feel the need to upgrade as my most of my needs are met with this machine. This problem is not a deal breaker for me, but it is an annoying to have to restart after leaving the computer for a while. I know the other option is to shutdown and startup each time I leave the computer for any timeframe longer than 30 minutes, but is annoying and I don't know how bad it is for the computer to be shutdown and started again so frequently. If there is a fix to take care of this problem, I am willing to try it.
Any advice would be appreciated.
Thanks in advance,
Maverick

the power logix thing was really sad. apple changed so much after 10.4.8 that there wasn't a viable way to patch the software.
That statement is precisely why I don't believe in blindly updating the OS, especially in a non-standard machine.
We can't expect third parties to support us forever, and it is shameful to break something that works fine, except that we updated the OS....
I think that any upgrade or modification to a machine or the OS greatly increases the risk of trouble or incompatibility with current configuration and "new" system files.
After all, the component or software could only be tested as far as the current OS version when the component or software was released.
Beyond that, we are all "beta testing".
Following a beta tester protocol, and applying updates to a cloned system drive first, is a prudent way to approach updates, and not only for older, heavily modified machines.
After 10.4.8 and moreso with Leopard, the focus is primarily on Intel architecture, not PPC architecture.
Like it or not, we are all updating to the abyss of the extinction of our machines, unless we can be satisfied with the last stable version of OS that works well with our hardware and software.
I wish they would include the latest pkgs at least with software update.
Yes, having individual packages, rather than lump "OS X 10.x.x" updates would be nice.
This way, one could update as one sees fit. That is to say, for example, fix the Quicktime, but leave my Network alone, etc., etc.
In all fairness, Apple does provide for some breakdown of updates, but I believe there is much room for improvement, especially, as you point out, with regard to the core services portion of the OS.
Until then, I'll leave Software Update disabled.......

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    This is because while you've re-installed the system, you've preserved the user account.You need to do a  "clean" install meaning a reformat and install. If the Mac orginally shipped with Lion or ML you can redownload via Recovery Partition but if the Mac shipped with Leopard 10.5.x or Snow Leopard 10.6.x then you need the OEM discs that shipped with it. You can call Apple and they will send you the discs for a nominal charge.

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