My monitor suddenly appear a 'dead line' horizontally..

What horizontal lines do you mean? I can think of several.

- You could have a line of dead pixels on your monitor, this would probably be caused by wear and tear of the monitor, or because it has been handled the wrong way.

- You could be experiencing 'screen tearing'. This is caused by your videocard struggling for a moment.

- If you're running an older, analog monitor, it could be because the cable you're using is getting older and needs to be replaced.

Hi there.
I have recently written a tip about this vertical/horizontal line problem. I suggest you give it a read and let me know how it goes. You can see it here: http://www.fixya.com/support/r9352105-fix_colored_vertical_lines_lcd_display

Slasher_X

problem in vertical section.

1. Solder the vertical ic

2. vertical ic supply capacitor problen.

3. dry points in neck board.

Remove dry solder at Vertical IC if problem not solves replace VERTICAL IC and pf104

Darshan

check the cords and make sure theyr all connected properly.
both the computer end and the monitor end

What is wrong with your monitor is that the Horizontal section is going faulty, the lines you are seeing are the Horizontal Retrace lines, usually invisable in a working unit. It is often a faulty capacitor(s) OR a Diode breaking down.. in the area of the Flyback Transformer. Probably time for a new one unless ya can fix it yaself.

The screen you have is almost certainly on the way out. This type of fault is in the Horizontal Flyback section of the Monitor. Usually components fault or age and change value, these lines are normally "Turned Off" so ya can't see them, that "Turn Off" circuitry is going faulty.. it will only get worse. I suggest a new, or 2nd hand monitor as they are so cheap these days fixing CRT monitors can be cost prohibitive.

I know I have seen thin lines in the past on older CRT monitors, these are usually wires which support the aperture grill. LCD is just a panel so this must be something different. What color is the line? It is probably an error in the scanning process.

you have AC ripple getting into your horizontal output. you have a power supply problem in the monitor. take it to get it fixed.