DVI shutting down my computer- if dvi adapter connected will not re-start

I have a G4 12" Powerbook running Leopard 10.5.4. I just noticed that when I plug in an adapter for external video into my DVI port the computer flashes a blue screen then asks if I want to shutdown. before I can answer it turns off. This happens whether a monitor is attached or not. If I try to restart with the DVI adapter attached the computer shuts down before the startup is complete.
I use to use external monitors a lot but have not for the last 2 months when I went to try it will not work. What could be wrong??

I installed the Mac OS X 10.7.3 Supplemental update 1.0 on 3/24/12 and now it won't wake from sleep when put to sleep from the Apple menu or energy saver time out. The not waking from sleep did not happen before the update. (Safari 5.1.4, Digital Camera Raw C ups 3.11, and iTunes updated at the same time) I didn't have any sleep problems with the previous 10.7.3 update install on 2/3/12
iMac 21.5 inch 2.5ghz i5 Mid 2011 Lion 10.7.3 11D50. Mouse and keyboard are hardwired, no bluetooth, no other USB or Firewire devices. I tried the PRAM and SMC resets, Bluetooth off, All Sharing off and nothing works.
Energy saver set to sleep = never, works for now; if it doesn't sleep - it can't wake from sleep, eh?
In any case: other users might consider holding off on the 10.7.3 update 1.0, because I didn't have the sleep problem before.
I'm wondering if I can revert to the previous version 10.7.3 with Time Machine, or if there is a fix I haven't come across searching the forums

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