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Sounds like the screen is going bad. Isolate the problem by plugging an
external monitor to the laptop. Borrow a monitor from a neighbor,
friend, relative or co-worker to plug to the laptop. It can be
any kind of monitor even the
old big fat
crt monitors as long as it has a vga cable to connect to your computer's
port. If the Borrowed monitor does not show the black lines and snowy
background, that proves your video card is ok and the problem is
your lcd screen. If the borrowed monitor shows the same black lines ans
snowy background it means your video card inside the
computer has the issue.
The video will show
on most systems when you reboot without you having to do anything. Some systems
will require you to hit the FN (Function key) + F1 thru F12. Hold down
the FN key then hit the correct key for displaying on the monitor (F1 thru
F12). The correct key will normally have CRT/LCD on it or it will have
the icon of a display.
Hook a external monitor to the video output on the back of the laptop, if it works! you have a laptop screen issue, possibly caused by a loose video cable that connects from the motherboard to the LCD screen, if the monitor has the same problem it is a motherboard issue. Doing anything to the laptop "dis-assembly" will void the warranty, best to take it back for exchange.
Does the horizontal line appear on the LCD screen on the laptop?
To check if the video card is faulty or the LCD screen connect an external monitor to the laptop's external video port, power up the external monitor first then bootup the laptop. The Windows will automatically switch to the external monitor if the video card is OK. If not then the fault could be the video cable cable/connector or the LCD screen.
Get back to me with the results of this test and I can advise further.
Normally this is due to several different things. I can give you a few suggestions but you will have to do the detective work. First this can happen because of a bad video card. This can also happen because of a bad connection to the mainboard or a bad cable from the mainboard to the back of the LCD. Last but not as likely is just a bad LCD. Try hokking the laptop to an external monnitor. You should have a 15r pin connector on the laptop to connect a standard monitor to it. There should also be a Fn key that allows you to activate the external part of the LCD. You have to know which key to hit with the Fn key to activate this feature. You can also try to hook up the external monitor before starting the laptop. This normally makes the external monitor activate. If you see the lines on the external monitor as well then its the display adapter not the cable or connection. If the external monitor is clear then try the video cable. The least expensive and easiest to replace is the video cable. Check to see if it has a good connection to the mainboard. If you still have a problem then replace the cable. If that doesnt work and you are really fond of this laptop try replacing the mainboard (unless your video card is replaceable on the motherboard then replace the video card). If you dont want to sink a lot of money into the laptop and the video cable doesnt work then run it on an external monitor. If you need the portability of a laptop and you have determined that the mainboard is bad then you might just replace the laptop and transfer your data. Hope this helps...