G4 Quicksilver won't sleep with Dell 2407

I unpacked and setup my Dell 2407 lastnight, and I'm happy with it, but have one query.
Once I had it set up, I set the computer to sleep, and the display went black, with the buttons turning yellow instead of green as they should, but the G4 didn't sleep, just stayed running (I could hear the fans and the power light stayed on, not pulsing as it would in sleep) and wouldnt wake again until I restarted.
The display is connected through VGA to the standard 64Mb Geforce 2 Twinview card, with the USB connected to a Belkin USB2 PCI card. I also have a Playstation 2 connected to the display, but I don't think this should affect the Mac. I have had a quick google about this and I have a feeling it may be related to being connected to the USB2 card and not the built in USB ports, but I'm not sure.
Powermac G4 867 (Quicksilver) Mac OS X (10.4.7) Dell 2407wfp, Belkin USB2 PCI Card, 802.11g PCI card, D Link Bluetooth USB stick, FW 120Gb HD

Thanks bhgdfh, I've just come back from work, plugged the screen into the built in USB instead of the USB2 card and its fine. All sorted now.

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Hey Renecek,
My first thought was, "Hey, you are using closed-clamshell mode".
How to use your Mac notebook computer in closed-clamshell (display closed) mode with an external display - Apple Support
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For that, check out the suggestions in these articles.
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A number of sleep-related issues can appear after incremental Mac OSX updates, including the inability to properly go to sleep, problems waking from sleep, and having your display go to sleep without your Mac going to sleep. The most common culprit is Bluetooth. Try these tips to fix your sleep problems.
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In System Preferences>Bluetooth, uncheck Allow Bluetooth Devices To Wake This Computer. If you are using a Bluetooth mouse and keyboard, you'll have to wake your Mac by pressing the power button.
FILE CORRUPTION
Your Bluetooth preference file may be corrupt-you'll need to delete it. Turn Bluetooth off, then go to the /Users/user name/Library/Preferences folder. Look for a file called com.apple.Bluetooth.plist and trash it.The OS will create a new preference file when you enable Bluetooth again.
ENERGY SAVER
If you have issues with a Mac or display that goes to sleep at inappropriate times, you may have a problem with Energy Saver. Delete the following .plist files and restart:
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-/Library/Preferences/SystemConfiguration/com.apple.AutoWake.plist
A restart is very important after deleting these plists. After a reboot your Mac will then generate new ones.
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Some, in these forums, have had luck fixing sleep issues downloading the combo update from this site (yours may be corrupt), not Software Update, disconnect all firewire + USB devices except keyboard + mouse, Repair Permissions, re-install update, Repair Permissions again + try.
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G4 Quicksilver won't sleep with Dell 2407

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