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Hi,
Please I have a Dell Inspirer laptop from a friend with
windows Vista home Edition. The laptop works alright on battery but
when it is connected to the the mains the screen goes off. In fact the
screen goes off after it has finished booting. it is the back light
that goes off cos the desk top could be seen dimmely in the
background. Also when the mains is removed, the machine has to be
reseted b4 it will work normally. Please help Thanks

Check the easy stuff first, is it set to use an external monitor instead of
the internal panel?