Screen goes dim

Lately, about once every two days, the light on my laptop screen slowly but surely becomes dimmer for about 10-20 seconds until it is near black. Then it suddenly lights up back to normal. Any idea what is causing this?
Thanks,
J

does this behaviour occur on external monitor? also have you tried to update the thinkpad power manager and bios?
this dimming could be caused by softwares (which we try our best to rule out first) or the CCFl backlight/inverter hardware.
Regards,
Jin Li
May this year, be the year of 'DO'!
I am a volunteer, and not a paid staff of Lenovo or Microsoft

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Hey Mark,
Not sure which iBook you have but look here for the takeapart.
They're all pretty similar.
http://www.baconeggs.co.uk/manuals/index.htm
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Message was edited by: spudnuty
Message was edited by: spudnuty

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Why does my screen goes from bright (normal) to dim?

I hope someone can help. My screen keeps going from bright (normal) to dim then back to normal .

It could be a short in your power adaptor cable, break or crack in the power jack that the power adaptor plugs into, a failing power inverter (small long thin circuit board in the screen that converts DC back to AC) or some unusual setting in the power setting for the laptop. I have no idea what that last one actual is but I am guessing. Look at the notebook and note which lights are on when it is bright. See if the external power light goes out when it goes dim. This happens when you go from plugged power to battery. Try to run the notebook with the battery out of the system for a day and see if you still have the problem. Maybe the battery is starting to short out.
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Screen goes dim

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