Posted 24 May 2007 - 10:35 AM
Usually this is a sign of a bad AC adaptor plug (also known as a weak point on most laptops). It's either the plug from the AC Adapter that goes into the computer or it's the receptacle on the inside of the laptop. The dim/bright occurs whenever the current changes from battery power to AC power (it's the computer trying to save power by dimming the display).
You can check the AC Adapter with a multi-meter. While checking it, wiggle the cord near the plug to see if the readings change - if so, then that's likely to be the problem. Check the receptacle in the laptop to see if it appears to be loose - if so, then that's likely to be the problem. It's been my experience that it's most often the receptacle that goes bad. And it's an expensive repair at the major service centers (they just replace the entire motherboard). The part itself (from what I've seen) is about $50, then there's some delicate soldering involved - a small local computer shop may be able to do this without diving too deeply into your pockets.
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