PowerMac G5 hangs after going into screen saver power save mode

I have a PowerMac G5 and it's been working fine, but as of late has been hanging. I had a couple of external disks on the machine ( Maxtor OneTouch II and a OneTouch III). I recently added two more OneTouch III and stripped the three OneTouch III's together in a RAID set. I'm wondering if that is causing the hangs, but I've also seen it hang without the RAID so I'm not convinced it's the RAID.
Anyway, I can't figure out what's causing it to hang, but it seems to hang at some point after the screen saver runs and then the screen goes into power saver mode. It's not hung right when it shuts down the monitor, but at some point after that.
When it gets in this mode, I can't remotely login using ssh and I can't seem to wake it up. What I end up having to do is to hold the power button down for several seconds until the machine powers off.
In an attempt to see what's going on, I set the OS X monitor power save mode to "never", but I don't think I left it that way long enough and I never saw it hang.
Does anyone have any debugging tips that would help me identify the culprit?

I've been having the same troubles lately. Seem
since the JAVA update. It hangs completely after the
screen is shut down. Every morning I have to reboot
with the power button.
I am also joining the crowd with this issue. I have a 15" Powerbook G4 that has acted normally until recently. Not sure exactly when it started, but about the same time as the recent updates. Similar behavior to the previous forum posts.
When I manually put the laptop to sleep it freezes up before it sleeps and the multi-language reboot warning comes up. This also happens if it is set to auto-sleep after xx minutes.
When I try to wake it up, the screen is black and the power light shows it is on and it never unfreezes or I get the reboot message.
I have tried everything I can think of to troubleshoot this. I just re-installed the 10.4.8 update over the exisiting one (using an external boot drive made with SuperDuper) and it still happens... BUT when I put the laptop to sleep with the startup drive being external, it seemed to behave properly. I can't figure this out since the external clone was made only minutes earlier from the laptop... and it works. I have zapped PRAM, and done the battery removal / power button reset.
Below is the "report" I have been getting - and sending to Apple. They must be getting tired of the many I have sent.
Any thoughts out there?
Thanks.
Unresolved kernel trap(cpu 0): 0x300 - Data access DAR=0x0000000000000020 PC=0x00000000002FA2A4
Latest crash info for cpu 0:
Exception state (sv=0x32E70000)
PC=0x002FA2A4; MSR=0x00009030; DAR=0x00000020; DSISR=0x40000000; LR=0x002E31B0; R1=0x1793BCD0; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x002E31B0 0x002AE920 0x002F2EF4 0x0003C884 0x000A9314
Proceeding back via exception chain:
Exception state (sv=0x32E70000)
previously dumped as "Latest" state. skipping...
Exception state (sv=0x2D24BC80)
PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown)
Kernel version:
Darwin Kernel Version 8.8.0: Fri Sep 8 17:18:57 PDT 2006; root:xnu-792.12.6.obj~1/RELEASE_PPC
panic(cpu 0 caller 0xFFFF0003): 0x300 - Data access
Latest stack backtrace for cpu 0:
Backtrace:
0x00095138 0x00095650 0x00026898 0x000A7E04 0x000AB780
Proceeding back via exception chain:
Exception state (sv=0x32E70000)
PC=0x002FA2A4; MSR=0x00009030; DAR=0x00000020; DSISR=0x40000000; LR=0x002E31B0; R1=0x1793BCD0; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x002E31B0 0x002AE920 0x002F2EF4 0x0003C884 0x000A9314
Exception state (sv=0x2D24BC80)
PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown)
Kernel version:
Darwin Kernel Version 8.8.0: Fri Sep 8 17:18:57 PDT 2006; root:xnu-792.12.6.obj~1/RELEASE_PPC
Model: PowerBook5,8, BootROM 4.9.5f3, 1 processors, PowerPC G4 (1.5), 1.67 GHz, 1 GB
Graphics: ATI Mobility Radeon 9700, ATY,RV360M11, AGP, 128 MB
Memory Module: SODIMM0/J20STANDARD, 1 GB, DDR2 SDRAM, PC2-4200S-444
AirPort: AirPort Extreme, 405.1 (3.90.34.0.p18)
Modem: Jump, , V.92, Version 1.0,
Bluetooth: Version 1.7.8f2, 2 service, 0 devices, 1 incoming serial ports
Network Service: Built-in Ethernet, Ethernet, en0
PCI Card: pci106b,4318, sppci_othernetwork, SLOT-A
PCI Card: TXN,PCIXXXX-00, cardbus, PC Card
PCI Card: usb, usb, USB20
PCI Card: usb, usb, USB20
PCI Card: usb, ehci, USB20
Parallel ATA Device: Hitachi HTS721010G9AT00, 93.16 GB
Parallel ATA Device: MATSHITADVD-R UJ-846,
USB Device: Bluetooth HCI, , Up to 12 Mb/sec, 500 mA
USB Device: Apple Optical USB Mouse, Mitsumi Electric, Up to 1.5 Mb/sec, 500 mA
USB Device: Apple Internal Keyboard / Trackpad, Apple Computer, Up to 12 Mb/sec, 500 mA
15" G4 PowerBook 1.67   Mac OS X (10.4.8)  
G5 2.7 Gig   Mac OS X (10.4.4)   3 Gig ram
15" G4 PowerBook 1.67   Mac OS X (10.4.8)  

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