Have you tried just plugging in the AC adapter to see if it is a battery or battery control problem? Since it works when plugged into the docking bay, that seems a reasonable test to me. BTW, other than the laptop, what else is connected to the docking bay?
rubberman
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Try taking your laptop to a computer repair shop and see what the expert have to say.
jingda
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So you were saying that either plugged in or not, it would still goes dark after several hours right?
First assumption for that would be probably the brightness for your laptop. This usually do if you run on battery. If you have set brightness to lowest by accident, set it to high again and see what happen
Second would be the screen itself has gone bad, as you have take your laptop to a repair shop for replacement. They are right actually. Your screen need to be replace even when you used it fine for a couple of hours. Dark screen probably better but don't wait till it fully black screen.
Well third would be probably your Windows configuration. You could put this as second but I prefer this as third assumption.
This is a DIY test so it would take some time to test this. First of all, download Puppy Linux 's .iso from the link. Once done, open the .iso files. It'll automatically told you to insert a cd to your cd/dvd burner and burn it. Then insert the cd back and reboot your computer. After reboot, set your BIOS to run from CD first and Puppy Linux would do the rest to initialize.
After it finally boot with success, leave it for several hours. If it indeed goes dark even when you move the cursor, then it's confirm you have a bad screen and need a replacement.
flagstar
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