Power error: compaq r4000

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Hi there

I have a compaq r4000 with windows xp

My problem that has only just happened is that when the power cable is
IN the the screen becomes DARK, when the power cable is out the screen
becomes LIGHT.  I assume you can see the fail in logic there.  its
very annoying when im photo editing.  

I have gone into power manager but there is no option to amend this.

Please help

Re: Power error: compaq r4000

Are you sure you can't set screen brightness for battery and for power so
they are the same? Or not?

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