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Their are a couple things that could be causing this, My first thought is that the screen its self is damage. A LCD screen is composed of millions of tiny pixels so when some fails others will still work.
That other thought is that the GPU or video device on the laptop could be failing and creating video problems. Have you tried closing the laptop and opening it agian, this would help rule out a bad cable connection.
I do not know any setting that makes a vertical line red-yellow-green from (top to bottom)
If you can find a monitor to connect to and know how to tell the PC to send a signal to it (ie, on a Dell it is Function F8) you can determine if it is your Video card or your screen that has failed. The Video card is part of the Motherboard and very challenging to replace. The LCD screen however is not as expensive and relitively easy to replace. You can watch YouTube videos on how to. A screen can be found at sites like Amazon and EBay.
This indicates the LCD panel is dead if the red lines are going from top to bottom then its the lcd screen thats faulty it there is green/red line going from side to side then that means the motherboard is faulty, if you have just bought it from hp they will replace it if you bought it from a dealer or a second hand shop you will need to go back to the shop for a refund
I have never had this problem, but what I am thinking it could be is all of the primary colors that are used have gone out besides the red color. It might not be in the graphics card but something in the screen that has gone wrong, you might need to go into the computer and reset some like the color balance. That is a very weird problem, sorry for your trouble, I hope I helped in some way.
if cleaning the LCD physically does not work and this appears even in the BIOS screen and not showing on an external display, it would be specific to the LCD and the only way to remove it is to replace the LCD.
try to go to BIOS, how to do that? turn off pc then turn it back on while the laptop is turning on,keep on tapping F2... once you are in the BIOS,check if theres still yellow and green lines,if its still the same,the problem is with the LCD or LCD cables itself, if none,try to update the driver of the video card...
You've managed to "crack" the LCD screen, by putting too much pressure on it.
Take it to a qualified computer technician, and get them to replace the screen, either by ordering a replacement from the factory, or by seeing if they have a "generic" LCD-screen which is compatible, and would be less expensive. Try looking on eBay for 'LCD replacement' for your Compaq Presario' system.