I'm also experiencing same sort of white screen problem.
Video seems unstable when first turned on. If notebook is just turned on and left alone, it will usually "white out". However, if I am patient enough to wait through the boot-up sequence, then start using the computer immediately, the video sometimes remains stable. The "white out" isn't pure white. but seems to consist of moving narrow vertical stripes of varying shades of near white.
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Re: I'm also experiencing same sort of white screen...
To determine if the LCD screen or the video card is faulty, connect an external monitor to the video connector on the laptop. Power up the external monitor first and then the laptop. The video should divert automatically to the external monitor and if you get a normal image then the video card is OK and the fault could be the LCD screen or the video cable.
Reseating the video cable and connector on the motherboard could fix yout problem.
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You mention in your post to branded laptops. You can try to check if the problem is from the LCD or from the Video card. Connect your laptop to an external monitor and check if the white vertical line appears, if yes replace motherboard if video card is integrated, if expansion then replace video card alone. If no lines from the external monitor then laptop LCD has the problem.
Try updating the video driver. Also try to connect your laptop to external machine to check if the video display on the other machine is ok or not.
If same problem occur, suspected the LCD of your laptop is faulty and needs to be replace.
Seems it is the Video card which has gone bad, If in case your system shows Compaq on your screen, os in that case need to install windows in the system again.But if it does not , Please get your system's Video card again.
First I would ensure my video cable was firmly connected. Sometimes that connector does not seat all the way causing what you are seeing. That is the rectangular connector leading fro the cable on left side of the LCD to the motherboard. Normally there are several hardware components related to a white display. LCD, video cable, or motherboard all causes of white screen. Have you checked external video? What was the original issue before motherboard and keyboard replacement?
To isolate the issue further connect the notebook to an external monitor and check the display on it. If the display is perfect on external monitor then the issue is with the LCD screen of the notebook.
If you have got the same lineds on the external monitor then the issue is with the video card of the notebook.
Try to get hold of a tri pronged screwdriver to open up the back of your ds (you can get them from "www.whitedog.co.uk/catalog/nintendo-wing-screwdriver/p-1169.html". Once you have opened it it should be easy to sort out as you can take the whole screen apart. It's quite easy once you've got the screwdriver :-)