My ibook G4 shuts off randomly without warning when it's plugged in.

I have a ibook G4 (late 2004) running leopard. I recently (a month or so) installed a new HD, since original finally failed. I have been running my ibook on power only for 3 years, since my battery stopped charging.
In the last few days my computer has started shutting off completely without a pattern or warning. I hear a single click as it shuts off.
This began when I was using hulu and wanted to plug the video adapter in as a larger display on my TV. In order to do this, I closed the ibook (putting it to sleep) while on hulu. Plugged in the video adapter and opened the ibook. It seemed that my computer had shut off suddenly when I opened to awaken it. I held down the power button to hard reset it, not knowing if the comp. was off or not. A low-long beep came from within the computer and the sleep button blinked very quickly about 8 times or so(too fast to count).
Ever since then I can't trust it to stay on for any amount of time. Sometimes it will shut off as it is booting. Other times it may run for several hours then suddenly shut off.
I am wondering if some other part of this ibook is dying or if I created an issue with the video adapter? Any help would be greatly appreciated.
Thanks in advance,
Jason

HI,
Try Resetting the PMU
Might want to run the Apple Hardware Test also.
Carolyn

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