Hp pavillion dv6000 push the start button, lights come on for ''split second'', and nothing. lights go off, no motor, no nothing. happens when plugged in or not

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From what you are describing, the motherboard has failed. I would however like you to try a couple of things though. First remove the hard drive and see if the computer will go to the BIOS screen. If it does not, then the Motherboard has definately died. If you can get to the BIOS, then you might consider a hard drive failure, or your windows installation is so corrupt, it is causing this problem. I would however lean toward a bad MOBO....seems this model, the DV6000 and the DV9000 have serious cooling issues and tend to burn their mobos up. HP recently started updating the BIOS files for these models so the fans and processor run more efficiently to keep the laptop cooler.

Try unpluging it then take the battery out then replace it after 30 seconds and plug it back in.

A lot of times these laptops are in a sleep mode (after a certain period of time which is decided by the windows or the user, the computers turn of the screen). I would start by pressing on the power button for a long time (about 1-2 minutes), then try all the basic stuff:
1. check the laptop's cable, if it looks okay or not, maybe there's a problem charging the battery.
2. try replacing the cable and the battery.
3. try removing the battery for about 24 hours.

update me if you have any developments

It's a fabrication defect. For more info about it and free repair see here

Sounds like you are having a video issue on the motherboard and that is not a software or easy fix. Most people have to change out their motherboards when it comes down it in regards to this type of activity.

You may need a new power supply, It may be putting a bit of power out but not enough to run thr comp

you have to send it back to hp to get it fixed, this is the second time mine had the same problem

Try FN + F7

Hold the power button in on the computer for 5 seconds. Wait another 5 seconds. Now hit the power button as you normally would to turn the PC on. It should boot normally.