I thought I would chime in on this thread. I also have a v2000 that overheats.
It's a v2670CA. Brand spanking new and clean as a whistle.
The overheat and auto powerdown occurs when running programs that work the CPU hard for an extended period. A video game, Google Earth with 3D buildings enabled, or even just a complete scan with a virus scanner. I always use the laptop on a hard flat surface with plenty of elbow room for ventilation.
The fans do come on, so I know they are not faulty.
I originally thought that Windows XP was somehow to blame, so I installed linux on the laptop (Kubuntu Drapper). Same problem occurs, compiling a large program makes it overheat.
Ok, so in my mind, it is one of two things - a BIOS problem (not starting fans soon enough), or a hardware design flaw (poor location of fans, heat sync insufficient, etc).
At this point, I contacted HP support. After several days of useless email exchanges, they provided me with step-by-step instructions for updating the BIOS. The release notes for this update lists: "improves system fan control"
After updating the BIOS, the same problem exists. I *think* it improved slightly, but I can still make the system overheat quite easily.
After informing HP support, they sent me a template email indicating that my problem cannot be resolved through HP email support, and that I need to mail mu laptop to them. It goes on to give instructions, and makes the important point that my harddrive will be wiped clean.
Well, I'm not going to go without a laptop for 2 months, only to get back a new/refurbished one that exhibits the same problem. I'm still confident this is a design flaw or still a BIOS problem. Either way, more people need to inform HP if they exhibit the same problem - it's the only way they'll acknowledge it.
The only solution I've found is keep the base of the laptop at a sharp incline from the desk (like > 40 degrees). Setting the back on a pile of CDs or books seems to do the trick. This helps the fan on the bottom of the laptop ventilate properly.
That's my story. If others have the same problem, please post to this thread and open a support ticket at HP