This model is well known. You can type in DV9000 at google and the first hit is HP's extended warranty (which may be over by now.)
We know what it is, what caused it and the fix. Sadly I can't spend too much time explaining that the motherboard exchange is the cure.
Hello, I have an HP Pavilion dv9000 here that is having quite an odd issue. I did some searching on the forums here but did not find much help.
When you press the power on this laptop, all the lights will turn on, and look like it is starting to turn on, but nothing will happen on the screen. Sometimes the fan will start for a second then stop. After about 15-20 seconds, it will auto-reset itself and do the same thing over and over until you take out the battery or hold the power button to shut it off.
I have done the following to the computer to check problems:
Firstly, I took the battery out and did the hard reset with the power button as stated in the stickies in this forum.
Secondly, I took a hard drive out of a completely working laptop, and installed it in this HP. It was worth a try, but I didn't really think the hard drive was the problem as pc's will still boot to a BIOS screen and setup even with no hard drive through the onboard memory.
Third, I plugged an external monitor into the laptop to test to see if it was just the screen that was bad, being very doubtful, as again, the computer would still boot up with a bad screen and not keep doing the reset thing.
Lastly, I took the entire laptop apart and cleaned everything with the electronics compressed air cleaner I like, made sure everything was snug in the processor and what-not, and put everything back together really nice...
This leaves me to believe there may be a problem in the Motherboard or Processor? Is this what it sounds like to you all?
Please give me your input and if you have any more advice on other things I can try before telling this person they need to buy new internals. Thank you very much!