Sleeping/Waking an Xserve G5?

I've been doing a bunch of testing recently and am having an (interesting) problem trying to get an XServe G5 to wake from sleep. Sleep mode clearly works (as the power light will pulse, as expected), but every mechanism that I use to wake it fails.
Waking with ARD will attempt to start the machine, and fail after 10 or so seconds saying communication failed.
Sending the magic WOL packets through perl scripts, 3rd party tools, and other ways all fail.
Diagnostics:
I have verified that the nodes are (apparently) configured for the Wake-on-LAN access:
root# systemsetup -getwakeonnetworkaccess
Wake On Network Access: On
I have also verified that the magic packets are sent properly using tcpdump to inspect the packets. They are sending the magic sequence properly.
Figuring that the XServe G5 may only listen for WOL packets on en0, I tested only that port. (For what it's worth, en1 also failed the waking process.)
The node can be woken up by pressing the power button quickly. The restore DOES work, just not the WOL portion.
Has anyone had any experience with this problem?
1,750 clustered XServe G5s Mac OS X (10.4.3) 2xDual 2.0Ghz G5 PowerMac, 2.0Ghz MacBook Pro

Sending the magic WOL packets through perl scripts, 3rd
party tools, and other ways all fail.
You don't say what third-party tools you tried, nor whether
any of the methods you tried work on other non-Xserve Macs.
Just for curiosity, so that we know we are starting from a
good test basis, try the free Wake-on-Lan utility:
http://www.readpixel.com/wakeonlan/index.html
I've never tried it on my Xserve G5, but it does work on the
other Macs on our LAN.
Russ
Xserve G5 2.0 GHz 2 GB RAM Mac OS X (10.4.8) Apple Hardware RAID, ATTO UL4D, Exabyte VXA-2 1x10 1u

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Welcome to the Apple discussions.
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I've been dealing with this for a while now and have come up with 2 new errors. This is happening when the computer is woken from a long state of sleep. I can't seem to reproduce it simply by sleeping & waking the computer.
Unresolved kernel trap(cpu 1): 0x300 - Data access DAR=0x000000005330A9BC PC=0x000000000033BB94
Latest crash info for cpu 1:
Exception state (sv=0x5b3dea00)
PC=0x0033BB94; MSR=0x00009030; DAR=0x5330A9BC; DSISR=0x40000000; LR=0x0033BB8C; R1=0x63617580; XCP=0x0000000C (0x300 - Data access)
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0x00000000 0x0033BBE8 0x0033FF6C 0x00340394 0x5B302088 0x638DD5B4
0x644FFC10 0x64500F6C 0x64501124 0x644F010C 0x644DD724 0x644E9CB0 0x644E427C 0x644E4100
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0x6377F02C 0x0034C700 0x0034CAC4 0x0003F9BC 0x000B0E54
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com.apple.driver.AppleOnboardAudio(2.5.7f2)@0x644db000->0x6451ffff
dependency: com.apple.driver.AppleDBDMAAudio(2.5.7f2)@0x644ad000
dependency: com.apple.iokit.IOAudioFamily(1.6.5fc3)@0x63779000
dependency: com.apple.iokit.IOUSBFamily(3.2.7)@0x6370c000
com.apple.iokit.IOAudioFamily(1.6.5fc3)@0x63779000->0x63798fff
dependency: com.apple.kext.OSvKernDSPLib(1.1)@0x636bc000
com.apple.driver.AppleK2(1.7.2f1)@0x638d9000->0x638dffff
dependency: com.apple.iokit.IOPCIFamily(2.5)@0x5b2f9000
dependency: com.apple.iokit.IOKeyLargo(1.7.2f1)@0x638c0000
dependency: com.apple.driver.IOPlatformFunction(1.8.7d5)@0x5b313000
com.apple.iokit.IOPCIFamily(2.5)@0x5b2f9000->0x5b30cfff
Proceeding back via exception chain:
Exception state (sv=0x5b3dea00)
previously dumped as "Latest" state. skipping...
Exception state (sv=0x5b365a00)
PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown)
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9G55
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Darwin Kernel Version 9.6.0: Mon Nov 24 17:39:01 PST 2008; root:xnu-1228.9.59~1/RELEASE_PPC
System model name: PowerMac7,3
panic(cpu 1 caller 0xFFFF0003): "Uncorrectable machine check: pc = 00000000000CE03C, msr = 1000000000101030, dsisr = 00008000, dar = 0000000084C9AA44\n" " AsyncSrc = 0000000000000000, CoreFIR = 0010000000000000\n" " L2FIR = 0000000000000000, BusFir = 0000000000000000\n"@/SourceCache/xnu/xnu-1228.9.59/osfmk/ppc/tr`

Hi-
I'd test the RAM, as errors from the RAM handling data can corrupt system software on the hard drive.
I'd test the hard drive, for above stated reason, as well as other corruption (non-RAM related errors) can also cause data access problems.
Beyond this, data access will occur via the VRAM of the graphics card, and via the cache of the processor.
Since you have been down the graphics card route, cache malfunction could be a possibility.
Along with Rember, run the system test from the AHT (Apple Hardware Test).
*A couple of notes on the Ballistix memory:*
The voltage rating is 2.8v, whereas the G5 uses a 2.5v rated DIMM.
DDR2 memory is rated at 2.1v, but the dual core G5 is rated at 1.8v.
Dual core G5's support CAS ratings of 4 and 5, but the Ballistix are CAS 3.
Crucial memory selector *does not recommend* Ballistix for any Mac model.
Granted, the RAM may function, but it does not meet spec, and can create phantom problems.
More notes from MacGuru's forum:
[Norm LeMieux] ...there's potentially another issue with DDR2 that may not have existed before for Macs: high-speed memories. If you look at Crucial's Quad-compatible modules (1GB), you'll see PC2-4200 modules with 4-4-4-10 timing at the top, followed by PC2-5300 modules (which are CL=5 @ 667MHz, but probably 4-4-4-10 @ 533MHz). This is the performance when the modules are powered by the standard voltage of 1.8V.
Ê The high-performance Ballistix modules can do 3-3-3-12 @ 533MHz, but they require a higher voltage: 2.1V. This is fine if you have control over your memory rail, but the Mac does not. And since the SPDs are programmed with "JEDEC-standard PC2-4200 values", the OS is just going to program the memory controller to run the same (4-4-4-10). Thus, there's no point [currently, on the Mac] is buying the high-performance modules which are $160 more per 2GB kit.
Ê Crucial has admitted that, if the system cannot operate at 2.1V, then it will "throttle down" and run at the standard rate. This mirrors what others have been saying elsewhere on the 'Net, but hopefully there's a little more information here.
I've seen many posts of system troubles that were the result of trying to use memory that was "better" than what is spec'd.
The facts of the matter are, that Mac's cannot really benefit from so-called "high-performance" memory due to the control of memory speed by the SPD.
Furthermore, using a product like Ballistix, which is targeted to the PC overclockers crowd, tempts fate with memory that is not of the spec put forth by Apple Developers.
Power Mac G5 Computers (October 2005) Memory Specs
G5 RAM Expansion Specs

2009 Quad MP freezes after waking from sleep

Hey again.
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but after I bought this MP it's been headache after headache. (Sleep issues, monitor issues..)
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I am a new mac user after finally having enough of Bill's Windows Bulls*.
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~Tony

Welcome to the Apple Discussions!
Does the same thing happen if you choose "Sleep" from the Apple menu, without closing the lid, and then try to wake it up?
Then when it loads it may freeze or I get a warning saying to hold down the power button to restart, finally after a few trys is will restart normally.
I think this is your bigger issue. It sounds like you're seeing a "kernel panic".
http://docs.info.apple.com/article.html?artnum=106227
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http://discussions.apple.com/thread.jspa?messageID=607531
http://www.thexlab.com/faqs/kernelpanics.html
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Theres been a lot of disscussion about this and it's a BIG problem. Check this out:
http://discussions.apple.com/thread.jspa?messageID=6597635&#6597635
http://discussions.apple.com/thread.jspa?messageID=6669894
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I hope Apple can fix this.
Tim

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=== from kernel.log ==========================
May 25 21:13:13 mini kernel[0]: System Sleep
May 25 21:13:14 mini kernel[0]: Wake reason = EHC2
May 25 21:13:14 mini kernel[0]: System Wake
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May 25 21:13:14 mini kernel[0]: The USB device Apple Keyboard (Port 2 of Hub at 0x26400000) may have caused a wake by issuing a remote wakeup (3)
========================================

As I noted above, computer goes to sleep by every way - power button, sleep timer, shortcut or menu.
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