curtains

hey can anyone help me I have a dell inspiron 8600, but the screen won't turn on without the AC adapter pluged in, the battery is fully charged... the thing is that I can turn it on with the AC adapter then unplug it and it'll still work it just needs to be started with the AC adapter.

When i start it without the AC adapter the whole computer starts up makes the windows noise so i know it loads up

i've try updating the bio's and the drivers none have fixed the issue, i've had a look throught the bio's and that has nothing to do with it.

Any help would be great

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ASUS P5W DH deluxe
E6400 OC to 3.2ghz fsb 400 1:1 ratio
Albatron Gefroce 7900GTX 512mb ram
Aspacer 1gig ram ddr2 800
3 250gig hdd
LG 18x duel layer etc DVD writer.
20" CRT monitor
Hyena 500w PSU

AdmnPower

sounds like a problem with the power inverter for the lcd backlight is having issues and is pulling more power than it is supposed to which would be why it won't come on when you power up when you're on battery and will come on when it's plugged in. I'm not sure exactly what you'd do about this though.

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Intel Core 2 Quad 2.4 ghz
4 gig DDR 2 800
Sapphire Radeon 3870 X2
250 gig Seagate Barracuda
Windows Vista