G5 strange sudden "sleep" mode

Just noticed some strange new behavior on this PowerMac G5:
left unattended for a while, I came back to the machine running on high fan mode with black screen.
Neither mouse nor keyboard activity could to get the G5 out of this strange sleep mode, so I had to force a shut down.
Subsequent Safe Boot and Disk Utility check did not find any issues.
Energy Saver settings: set to put computer & screen to sleep after 1h (harddrive option was not selected)
Anyone have an idea what could cause this strange stand by mode?

J & F wrote:
Thanks, old comm guy.
Unfortunately, no luck with any of the suggested solutions:
display not coming up after resetting the PMU, reseating the video card or in single-user mode.
OK, the one other area is the PRAM battery, which Apple claims can also cause this problem to occur. If the battery is more than a couple of years old, it is suspect. I would definitely try that route, as it is easy and relatively inexpensive. You can get the battery at Radio Shock but if you are near a Fry's, for instance, it's a lot cheaper there. Or you can check the open-circuit voltage with a good DVM and get a clue, the magic number being greater than 3.6 for confidence. More confidence comes with loading it with a 200 ohm resistor and measuring the voltage.
Could the video card failure have been caused by the AppleJack session
- or did the video card just decide to go?
I wouldn't expect AppleJack to have had any effect on the video card. I had a 9600 Pro tank last December, which led to a succession of replacements until I finally got to where I should have been to begin with, which is the Ultra 6800. Nonetheless, do the battery thing before trying another card.
As an aside, I started my little video card adventure by putting in a PCI video card from my G3, which did give me video but zip support for the cool stuff. That at least let me see that things were otherwise OK (I had already done the network trick, which gave me some confidence).
These things can be an adventure, so say the least.

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    com.apple.driver.NVSMU          2.2.9
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    com.apple.iokit.IOCDStorageFamily          1.7.1
    com.apple.iokit.IOSCSIBlockCommandsDevice          3.5.1
    com.apple.iokit.IOUSBMassStorageClass          3.5.0
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    com.apple.iokit.IOSCSIArchitectureModelFamily          3.5.1
    com.apple.driver.AppleUSBMergeNub          5.1.5
    com.apple.driver.AppleUSBComposite          5.0.0
    com.apple.iokit.IOUSBUserClient          5.0.0
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    com.apple.iokit.IOUSBFamily          5.1.6
    com.apple.driver.AppleEFIRuntime          1.6.1
    com.apple.iokit.IOHIDFamily          1.8.0
    com.apple.iokit.IOSMBusFamily          1.1
    com.apple.security.sandbox          220
    com.apple.kext.AppleMatch          1.0.0d1
    com.apple.security.TMSafetyNet          7
    com.apple.driver.DiskImages          344
    com.apple.iokit.IOStorageFamily          1.8
    com.apple.driver.AppleKeyStore          28.18
    com.apple.driver.AppleACPIPlatform          1.6
    com.apple.iokit.IOPCIFamily          2.7
    com.apple.iokit.IOACPIFamily          1.4
    com.apple.kec.corecrypto          1.0
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    Ciao.

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