The issue isn't related to a motherboard, despite Hewlett-Packard's claims. The issue is regarding defective NVIDIA graphics processing units which are not subject to a single motherboard configuartion. Hewlett-Packard attempted to claim that it only affected AMD motherboards when it's been shown that Intel motherboards are also affected. This has led to several issues with claims of preferential treatment being given to AMD motherboards based on faulty logic. Furthermore, Apple released it's own extension to warranties after NVIDIA came out and told them which GPUs were affected. They decided to lead their own investigation and found that the 84/86 series are also just as defective.
To the poster:
I would recommend going through the BIOS updates for your specific model. You will find that Hewlett-Packard shoved an update to the BIOS down the throats of those located under the extended warranty program that left the fans running longer and harder than normal. This has since come out for your computer (assuming it's a dv9000 CTO) on that same date. In fact, many of the computer models not listed have had the same BIOS update. For mine (a dv9460us), it came out 25 March 2008.
If you are interested in more information on the issue, as well as Hewlett-Packard's cover-up of the issue, search for "HPLies". The forums we provide list the issue in great detail, as well as what people are doing about the problem. Most people have resorted to filing small claims lawsuits. I am one of them.