Weird power quirk

[krazykritter]

I just got this laptop and I've seen it happen a couple times. When I've plugged in the power cord the screen will dim to the point it's not lit at all and won't come back to normal until I reboot but I can barely see the screen to do that. On two other occasions the laptop has actually completely shut off as soon as I plugged in the power cord.

I've updated all drivers from IBM and Win XP SP2 with all available updates. There are no hardware conflicts or unexplained errors.

Any ideas?

[slagmi]

Bad inverter, if you're lucky