Sounds to me like your motherboard is dead you can check out these guys they have helped me with replacement motherboards before. DV2000 Motherboard They always have very timely shipping and Grade A customer support.
If your laptop is under warranty the first thing that I would suggest is getting in touch with HP. They should be able to give you directions on getting your laptop fixed.
If you are out of warranty I would first suggest checking your ram and hard drive for errors using software such as...
You could always consider getting a new 444002-001 Motherboard at a low price. The prices are really coming down and it is almost worth the couple extra bucks to replace it and not hassle with repairing. :pt1cable: