On the laptop display only faint shadowy image. I replaced both the backlight and inverter – same scenario. There is a periodic (once a minute or so) grinding/buzzing emanating from the laptop near the dc power jack. Any ideas? Thanks!

PS – when I tested the backlight after the replacement of the same and the inverter it worked until I put everything back together.

HOw much does it normally cost to have the Backlight replaced alone in my laptop?

It depends on the laptop model and repair shop. You have to research.

my hp pavillion dv2000 has a cracked lCD. most of the screen has a black and white stains, with line all over. However, a little part if the screen about 10% of it is intact and i can view the actual computer screen on it what do you advise i do?

If the screen is cracked, you cannot fix it. The whole screen has to be replaced.
The following guide explains how to remove and replaced damaged LCD screen in an HP Pavilion dv2000 notebook.

http://www.insidemylaptop.com/replaced-damaged-lcd-screen-in-hp-pavilion-dv2000-notebook/

My HP dv6000’s screen just stopped working. I have it hooked up to an external monitor and it works fine. The laptop screen just remains off when i turn it on (without the external display). I don’t know what’s wrong with it. I was sitting on the couch with it on my lap and someone bumped into it and it fell on the carpet. And after that it was working fine. Then i turned it off as usual and when i turned it bk on, the screen never came back.

It’s possible that one of the cables inside the display panel got disconnected when the laptop was dropped.
Before replacing anything, I would try:
1. Reseating the video cable connector on the motherboard. This connector is located under the keyboard bezel, close to the left hinge. Here’s the guide for removing the keyboard bezel: http://www.insidemylaptop.com/take-apart-hp-pavilion-dv6000-laptop/
The video cable connector is shown on the last picture, but it’s hard to see because of the white sticker glued to the cable. By the way, it’s not necessary to disconnect the keyboard from the motherboard, simply turn it upside down and place on the palm rest.
2. Try reseating connector on both sides of the inverter board. One of them could be loose. This guide explains how to disassemble the display panel: http://www.insidemylaptop.com/remove-replace-lcd-screen-inverter-hp-pavilion-dv6000-laptop/
3. Finally, try reseating the video cable connection on the back of the LCD screen. Same guide as in the step 2.

All these requires laptop disassembly, so proceed on your own risk. You can damage the laptop by doing that if you have no experience.

only the lower right portion of my laptop screen lights up and after a second or two the screen start to dim until you can’t barely see the image on the screen and when you close the screen and open it up again same thing happens. which could be the problem, the inverter or the backlight.

I think this is the backlight lamp failure. Apparently the lamp is failing and has to be replaced. It’s hard to replace the lamp, so think about replacing the entire LCD screen.
Just in case, you can try reseating connectors on the inverter board. It’s possible that one of the connectors is loose and the inverter or backlight lamp is not getting enough power from the motherboard. Just a guess.

only the lower right portion of my laptop screen lights up and after a second or two the screen start to dim until you can’t barely see the image on the screen and when you close the screen and open it up again same thing happens. which could be the problem, the inverter or the backlight. please help..