I have an HP laptop which I bought about a year and half back. Recently I've been experiencing extreme screen trembling and flicker. The trembles are not very noticable until I start some graphic intensive application such as a game or play a movie. It even flickers when I open some high graphic webpage or document. It also flickers if my wallpaper is highly graphic. I uninstalled all recent and graphic related software, clean installed the latest graphic drivers but to no avail. I swaped both of my RAM modules but still no change (My graphics is RAM shared). I changed the amount of RAM for graphics from 64MB to 128MB to 8MV to 32MV but the problem remained. When I tried windows reinstall by booting from CD ROM, the setup program flickered as well so I concluded that this is not a windows specific problem and cancelled the install. I connected a CRT monitor to my laptop and experienced no flickering at all on the CRT while the LCD was either trembling or showing black. I am out of ideas, I am not sure what kind of problem this is. Please help me out.

Just a guess- Maybe what ever mode video transmission there is from the computer to the screen, in a laptop, may be wearing out.

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Choices include the video circuit on the systemboard for the LCD, or the LCD itself. If the unit is out of warranty this is typically a $500-800 repair, at least in the shop I work in. Boards and screens average $450 each from the different mfgrs. Most of what we service is Toshiba, but I also do HP/Compaq and IBM daily. Good luck Richard