Horizontal line appears even computer is off.

Nothing wrong with your mon. It is your windows display setting.
Go to display properties and change it back to normal.

See my tip here: http://www.fixya.com/support/r9352105-fix_colored_vertical_lines_lcd_display
The fix for horizontal lines is the same as the fix for vertical lines.

Enjoy my tip
Slasher_X

See my tip here: http://www.fixya.com/support/r9352105-fix_colored_vertical_lines_lcd_display
The fix for horizontal lines is pretty much the same as for vertical.

Hi,

You may reset your LG L1751S-BN to factory settings by:



1. Press the Menu button. OSD (On Screen Display) should appear on your LG L1751S-BN.
2. Press the Lightview +/- button to highlight Setup then press the Auto/Set button.
3. Press the Lightview +/- button to highlight Factory Reset then press the Auto/Set button.
4. Press the Menu button to finish.



I hope this works for you. Kindly reply for further assistance. Good Luck!



Thanks for using Fixya!


Mongkey
DELL Tech ID #456563
TIPS: Is your computer slow? This might help
http://www.fixya.com/support/r8158906-diy_manual_pc_tune_up
(for Windows only)

First attempt to use a different monitor on your computer, or use this monitor on another computer. If it appears that monitors only shut off when attached to your computer then it's safe to assume that you have a graphics card issue, not a monitor issue. If your monitor shuts off on another computer then your monitor is basically broke. To try to troubleshoot the graphics card, unplug your monitor from the computer and the wall. Now unplug your computer from the wall, open up your computer case and remove the graphics card. Using a can of compressed air, blow out all of the dust in the computer. Reinsert the graphics card, close the case, plug the monitor back into your computer and the wall and start the computer again. Hope this helps.

try another power cord, and a known working power outlet. If no good, replace power board or get a new monitor. contact manufacturer to see if it's in warranty.

Check the flex cable, it might be loose. Disconnect the monitor cable from the computer, if the issue still occurs, points of failure as follows: ac power cable faulty monitor

These are the possible reasons.

1. your video card doesnt't support the resoltion you selected.
2. you don't have the appropriate driver for your video card.
3. or check your video cable

Solution:

1. Try rebooting your PC.
2. Reinstall or update video card driver. Know the brand and model of your video card then surf the net for drivers on their website.
3. Try to lower your desktop video resolution. (1280 x 1024 Maximum Resolution)

If this things help you solve your problem, please rate me.

Thank you

regards,
-engrkoiled-

all those sounding intelligent and saying that replacing lcd hardware will fix the problem probably didnt have the problem themseleves . i had exactly same problem with samsung syncmaster 2043swx monitor . i just restarted and booted into safe mode ( by pressing F8 key at startup ) tried changing reolution in display settings . rebooted in normal mode and asll lines are gone and never appear again . i am uisng windows Vista . so i think it is probably a driver glitch something .

My sister's monitor wont turn on at all. She was shutting her system down due to a storm rolling in, and it said windows shutting down installing updates, while she is shutting it down. She turned it on today and the little light came on then it went off and hasn't been on since then. The Tower works fine but the monitor isnt turning on at all. What should she do? She has had the monitor at least 2 years no more then 2 1/2 years! And it is a LG Flatron 20". HELP