If any of you are getting lines on your LCD display (like a horizontal or a vertical), it's usually a bad LCD display (the panel itself has a very "partial", or "localized" failure). Someone here mentioned twisting the display - which you can do on laptops - that might make the problem go away temporarily, but in my experience, it (the problem with the lines) will be here to stay. You can either replace the screen panel, or you can remove the screen panel and have it shipped to repair facilities that specialize in LCD repairs - both of which could entail considerable cost, effort, AND expertise.

A lot of folks will toss out the word "inverter" when there's an LCD problem, so let's get it straight once and for all: the inverter is just a power board that converts your laptop's DC power into high-voltage AC current, and this AC current is used to power the backlight tube (or tubes) of your LCD screen - to "light the screen up", if you will. The inverter is also responsible for the brightness adjustments in your LCD display. Hence... if your screen lights up and you can adjust the brightness on your screen, then the inverter is doing its job and you can rule it out completely.

Speaking of brightness in LCDs, some LCDs will give you a perfect image that's got a "pink" tint to it - that'll be, in the vast majority of the instances, due to a burnt-out backlight tube. It's just like a florescent tube that's on its last legs. You can either replace the LCD, or have the LCD delivered to a LCD repair facility that'll replace the dimming tube for you.

Now, if your computer's LCD is completely black (doesn't light up) but you can still hear the rest of it working, then it can be an inverter that's failed or, in the event that your computer has been impacted, it can also be a shattered backlight tube inside your LCD. Anyway, my point it: if the screen lights up, it ain't the inverter.