Computer freezes in lid-closed mode when connected to external display

I have a Sylvania SC190 CRT display connected to my Powerbook via a VGA to DVI adapter. Every time I put the computer in lid-closed mode and try to run it off of just the SC190, after a few minutes it freezes up and I have to hard restart it(hold power button down).
Now, a few days ago, my powerbook stopped recognizing the display as an SC190, and just recognized it as a VGA Display. Don't know if this is relevant, as I have never used lid-closed mode before.
Does anyone know what the problem is, and/or what I can do about it?
Thank you.
PowerBook 15" G4 1.67 GHz   Mac OS X (10.4.8)   512MB, 80GB, SD-DL

I have the exact same problem.
Here's my story:
To give you some backgroud, my setup involves having the macbook on a mstand hooked up to an external monitor. I run a usb hub from my macbook, this is where my mouse transceiver is plugged in. I use am Apple wireless bluetooth keyboard (latest slim model)
I recently purchased the 13.3' inch 2.26 MBP as I gave my older 2.0 uMB to a family member. The computer is in the stock configuration with no hardware upgrades.
I have noticed weird behaviour when waking the computer from sleep when the lid is closed. When i wake the computer up (by tuning on bt keyboard), the keyboard light blinks like there is not bt connection and the computer will wake in an inactive state. The led light will be on, but when i flip the screen up....nothing. Screen is dark, keyboard pressing does not illicit any responses. I have to do a hard reboot by holding down the power button to restart the computer. Unfortunately any previous data or work is lost.
I work in IT so I completed troubleshooting and also things outlined on forums in google. Reset PRAM, reset SMC and also reinstalled OSX. Still I get the same result. Fearing I purchased a defective unit, I called Apple and they told me i could exchange the computer so I dropped by the apple store and exchanged it quite easily.
I've spent hours restoring from time machine and I am experiencing the same issue on my new laptop. I'm now assuming its not hardware but more firmware related as I had to do a bluetooth firmaware upgrade when I bought the computer when I checked for software updates.
Is anyone else having any wake issues with their new MBPs? And what should I do next? Should I exchange for a 3rd unit? Thanks for you help everyone.

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