G4 MDD randomly powers UP!

Hey all,
I have a G4 MDD which ran perfectly until now! I recently purchased a Samsung 2333HD tv for my room which I hook my mac up to via vga.
Worked fine to start with, but the next day I couldnt get it to power up. After reading some topics on here I managed to take the PRAM battery out, re-insert and then it worked fine.
Now though, my mac randomly powers up once its shut down!
Gets quite annoying when you hear the fan blasting air at 4am!!!
Any ideas?
Cheers

Well, there are a few things that might wake it...
Energy Saver>Options>Wake for Ethernet Admin access & Restart automatically after Power failure.
Have you replaced the PRAM Battery?
Any cats or mice around?
Have you reset the PMUI once yet, Earlier G3, G4, G5 models...
http://support.apple.com/kb/HT1939

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*Power Mac G4 MDD Random Shut-down Problem*
Note 1: shut-down is same as pulling the power plug.
Note 2: below is complete list of events, on dates not shown, computer working normally.
DATE TIME EVENT
May 9, 2008 noon Picked up computer from Phuket Alpha after replacing logic board and
complete check-out. (Power supply not replaced)
May 9, 2008 evening Shut-down several times, could re-start a couple of times and then shut-
down and could not re-start.
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Turned off UPS, turned on UPS and computer started by itself without using
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Shut-down minutes later, would not re-start using any method i.e., re-set
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May 19, 2008 1 hr later Shut-down while using Safari
May 19, 2008 evening Started computer OK, then placed in sleep mode.
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Hello the:
Welcome to Apple discussions.
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