HP Pavillion DV2500 Nightmares over heating, GPU and CPU running hot

EBay.

Wait why do you want a motherboard if the GPU and CPU are overheating? If you do want one, you should listen to jay_nar2012 and grab one IF you want an OEM one. They are quite expensive and there are aftermarket boards that are cheaper.

To be honest, the best thing you can do is move it to an aftermarket case, I have owned one HP computer (P6604f) and it had terrible airflow and would cause my graphics card to reach 70 degrees opposed to 52 degrees at load in my new case.