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Hook a external monitor to the video output on the back of the laptop, If the picture is nice and clear the laptop LCD screen is defective. To replace the display will be costly, Now! if both screens show the same problem it is the Video Graphics card that is part of the motherboard.
You may find that the LCD itself has been ruptured or fractured, producing this anomaly. This is known as LCD "bleed". Consult pictures using this term and an image search engine to confirm that this is the type of damage.
If the strip doesn't look like "bleed", it may also be a failing inverter, producing a distorted image because it is sending bad data to the video port and motherboard video processing circuits.
Test your video processing by connecting the computer to an external monitor using the VGA/DVI/HDMI out on the side of the notebook.
Using a search engine with any of those terms in bold will produce results to assist you as necessary.
from your description, it appeas to be an issue with the LCD since applying pressure has effect on it. I would advise to check with compaq for warranty repairs if you still have one active. The LCD may have to be replaced for this situation. You can try to use an external monitor to check if the video controller actually works properly
Its either one of two of these problems,1 select control panel,then control panel home,then adjust screen resolution, then pump up the resolution to max and make sure the colour field is at 32 bit and apply these changes........2 is that LCD display is busted for sure.
I have a Diagram of the Switch and some more info and tips on my Website re LCD Screens and troubleshooting. It could be worth Up dateing Your Bios and Your Graphics Drivers. more info at: www.powerjackrepair.com Hope this helps