I'm not sure if I understand your issue but I doubt that changing your hard drive or upgrading your ram would cause it to overheat. Make sure your system fan is spinning. You may also want to buy a can of compressed air and use it on all the fans and openings in the machine. Make sure you hold it upright so no liquid escapes into the computer. The goal would be to remove all dust and dirt from the machine. If you are still having problems you can email me at shane@driventechnology.com. Hope that helps!