The HP laptops with the NVidia graphics processors were the ones which suffered the worst from poor thermal management.
The Dell Latitude D620 and D820 family also had the same problems.
Both brands used a common heat spreader arrangement which tied the GPU, CPU, and Northbridge chips together.
To save a buck here and there, they used thermal foam to pull the heat off the hot-running NVidia GPU, which eventually failed in the BGA connection to the motherboard.
HP and Dell had a free repair warranty extension for those laptops, but it's long since elapsed.
I've had to rebuild about 1/2 dozen of the Dells, buying new OEM motherboards for the repair.
To prevent the problem from frying the new repairs, I've used copper shims between the GPU and heat spreader, with Arctic Silver 5 to maintain a decent heat transfer.
Then I install either l8kfangui.exe or SpeedFan.exe to make sure that the fans are running all the time.
The fans don't have to run at 100% RPM unless they're getting loaded down with GPU or CPU tasks, but they do need a constant flow of air.
Make darned certain that the air inlet and exhaust are religiously clean. One of the dead laptops I rebuilt for a customer had enough cat hair inside to build another cat.
