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LAPTOP OR NOTEBOOK COMPUTERS HAVE A KEY ON THE KEYBOARD IN THE LOWER LEFT SIDE THAT HAS A "Fn" MARKED ON IT, SHOULD BE BY THE CTRL KEY. PRESS THIS KEY ALONG WITH AN "F"KEY, NORMALY F5, ( HAS 2-BOXES WITH A DIVIDER LINE), WILL CAUSE YOUR SCREEN TO GO BLANK AS IT IS NOW SENDING THE VIDEO TO AN EXTERNAL MONITOR. PRESSING THE 2-KEYS AGAIN WILL APPLYTHE VIDEO TO BOTH MONITORS, THEN PRESSING BOTH AGAIN WILL RETURN IT TO YOUR LATOP ONLY.
Most of the times this is a screen issue. Meaning that you will have to change your screen eventually.
To be sure, connect the laptop to an external monitor and look at the display of that screen. If you see the same green line, then the motherboard could be defect. If you do not see the green line, then there is something wrong with your laptop screen.
If the screen is malfunctioning, the first thing you should do, is open the laptop, and check the wiring of the screen. If this does not solve the error, you should replace the screen.
WHITE is a mixture of the three "primary" colours.
If one of the colours is not working, then WHITE turns PINK.
So, either your LCD display is malfunctioning,
or the "data" cable between the LCD and the motherboard is malfunctioning (not transmitting all 3 signals),
or the video-card embedded into the motherboard is malfunctioning (not sending all 3 signals).
This is nothing that you can fix by yourself; take your computer to a qualified technician, for trouble-shooting and repair.
You possibly have a LCD screen failing, but to be 100% sure, you should hook your laptop to an external monitor, and see if the display is good . Any desktop monitor will work. If your display is good, you know your LCD on your laptop is failing, and if it is the same display as your laptop, you know you have a video chip problem on your laptop motherboard.
This issue is due to the malfunctioning of the screen or due to any other internal hardware malfunctioning of the notebook. To further isolate the issue, I request you to connect the external monitor and check.
Once after connecting the external monitor, please tsp Fn+F3Switch between the display and external monitor in the following order: Display External monitor Display and external monitor
If the external display is fine then the issue either could be due the malfunctioning of the display cable connector between the screen of the notebook and motherboard or due to the malfunctioning of the screen.
As this the hardware issue, Please contact the nearest repair center to get it resolved.
Try connecting an external monitor to the your laptop and see if the vertical line is also present on the monitor. If the monitor display is fine, then your laptop’s LCD display panel is defective. If the monitor also displays the vertical line, then your problem is with either the video card or motherboard located inside your laptop.Not sure if the Compaq Presario has an external monitor plug, but if it does the above procedure can be applied to that one as well.
Yes, this is a defective screen. The only fix is to replace the screen. It's called a column of dead pixels. Since it is under warranty, contact HP to have them warranty it out or take it back to the place you purchased it from for an exchange. Please take a moment and give this answer a good rating of fixya. Thank you.
Connect any Desktop monitor to the Laptop and check whether the Display. if the display is fine on the Desktop monitor screen then it can be identified as the Laptop screen malfunctioning.
And if the Display has the same issue that on the Laptop screen
then it can be treated as the Display card issue.
However, it seems to be Harwre related issue. Get the laptop veriufied under Technical supervision to repair the Laptop's display card or the Laptop screen to be replaced if the display is fine on the Externally connectd Monitor.