HP pavillion dv9000 screen went dead -- black

The problem is a damage to the MB by excessive heat produced by Nvidia GPU. The only way to fix this permanently is to take out the MB and reflow the GPU with heat. You can find a video on youtube how to do it. You must take out the piece of gel between GPU and cooling unit and replace it with copper bar or penny made prior 1983 - still made out of copper. Also clean the fan. Use heat transfer paste like arctic cool - not a glue, on both sides of the penny. Install win7. Win7 does not use the coprocessor and will help to ran the notebook cooler. Install speedFan 4.40 - free utility to see what the temp is of your GPU and CPU. If you did good job it will stay around 55C. If your HP notebook is still running check the temp. If the GPU is running 80C or more it will melt the connections on the MB and quit working sooner or later.

Due to the overheating issues with the dv9000's it's more than likely the motherboard has gone bye bye. You can try plugging your laptop to a regular desktop monitor to see if it's the screen; but you would have heard it chime on if that was the case. Unless you had your volume muted before the incident. Try checking the RAM (one by one), then remove the hard drive and see if you see any graphics. If none of those work, prepare for a dv9000 funeral or punt!