I have tried removing and replacing power, removing and replacing the battery, re-seating the memory cards — nothing seems to help.

Is there some sort of BIOS battery that needs to be replaced?

I removed the rechargeable battery for some minutes plugged again to AC/DC without the battery, and it still wont power on. Then I replaced the battery again, put the power plug to AC/DC yet it still wont power on. What could be the problem? I need your help urgently.

I have a dv6000 which has a webcam however, it does not show up in device manager. I have tried installing drivers which does not work because the webcam cannot be located. HP states it is a hardware issue but would like to know how I can remove the lid (without damage) to check on connection or replacing cam.

I have published dv6000 display disassembly guide here:
http://www.insidemylaptop.com/remove-replace-lcd-screen-inverter-hp-pavilion-dv6000-laptop/
You can access the webcam module if you remove the screen bezel as it shown in the step 3.
The problem sounds like a hardware related issue but unfortunately I cannot tell if you have bad web camera module or failed cable.
You should try reseating the web cam cable connector first.

I have a few problems with my hp pavillion dv 6919ca.. one since I had to replace my power jack now my touch pad doesn’t work.. I am thinking I put wires in wrong backwards what ever do you have a diagram on what way the wiring should go? yes i know I should have taken notice but I totally forgot when I went to put it all back together..

I don’t have a close up diagram but maybe I can explain.
The touchpad cable has four silver traces on it. When you install the touchpad cable these traces should be facing you (not the motherboard). Basically, you push the cable back into the connector with traces looking up.
By the way, here’s complete laptop disassembly guide:
http://www.insidemylaptop.com/disassemble-hp-pavilion-dv6500-dv6600-dv6700-dv6800-notebooks/

my device manager doesnt recognize my cdrom drive.. it shows up in bios under boot options but i did the remove upper and lower filter things from registry to no avail when I put a cd in it you can hear it run but it doesnt go anywhere.. I am running windows 7 and its been since I installed that OS

It’s hard to tell what’s going on. Could be failing drive or Windows OS related problem.
Here’s something to try. Do you still have Windows OS installation disc? Try booting laptop from this disc. Can you boot?
If the drive spins but will not boot, probably it’s bad drive.
If the laptop can boot from a CD but the drive will not appear in Windows, probably this is Windows OS related issue. Try reinstalling OS again.

problem #2.. my device manager doesnt recognize my cdrom drive.. it shows up in bios under boot options but i did the remove upper and lower filter things from registry to no avail when I put a cd in it you can hear it run but it doesnt go anywhere.. I am running windows 7 and its been since I installed that OS i have been having problems.. any help would be appreciated. ty

Please my uncle sent me hp dv6000 laptop and the webcam is not working

How it’s not working?
Can you see the webcam in the device manager?