Apple Studio 15" Display Shuts Down Computer

I have a 15" Apple Studio Display Monitor (M2454) that is connected to the port of my G4 Quicksilver.
This morning, the hard drive shut down unexpectedly, and when I pushed the power button on the front of the tower, nothing happened. I first checked the power source, and found that to be working. Then I unplugged all the peripherals, and tried the tower with a different outlet, whereupon it started immediately.
Then I returned the tower to its original location, and plugged everything in again. But once more the hard drive wouldn't respond when I pressed the power button.
So, I unplugged the peripherals one by one, and kept trying to turn on the machine. After I unplugged the USB device which recharges my ipod Nano, the computer finally rebooted. But then when my desktop came up, I found that my cursor was frozen. My USB keyboard was plugged into one of the two ports on the back of the monitor, and my mouse was plugged into the right-hand USB port on the keyboard. So I plugged the keyboard's USB into the monitor's other port, and rebooted the hard drive.
This time, the mouse was not frozen, but a few seconds after the desktop appeared, the hard drive shut down again without warning, and without the ipod device connected. I rebooted several more times, and the same thing happened.
I then disconnected the Apple Studio monitor, and connected an older Sony Trinitron monitor. Whereas the Apple Studio monitor derives its power from the hard drive itself, the Sony monitor can be plugged right into the wall. I then connected my keyboard to a port on the hard drive, and rebooted successfully.
So I'm wondering if anyone has any insights about what's going on here, and I'm also wondering if there's any kind of power adaptor that will allow me to power my Apple monitor from an outlet rather than from the hard drive.
And while we're at it, is there any kind of "extension cord," so to speak, for a USB device? My keyboard doesn't quite reach from the hard driveto where I would like it to be.

That's the way all Mac notebooks work and have worked for some time, regardless of the OS, if the external display is set in extended desktop mode. If set to mirror mode, the MBP should continue to run from battery.
So maybe the difference is not Snow Leopard itself but more the point that in Displays preferences mirror mode has been turned off since the SL update. Does that sound right?

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