zoar :
stock heatsink stock paste. i brought it to a computer guy. He fixed the fan, it was stuck. he took off the heatsink and reseated it. I have this ordered from amazon.
Cooler Master Hyper 212 EVO - CPU Cooler with 120mm PWM Fan (RR-212E-20PK-R2) and Arctic Silver 5 Thermal Compound 3.5 Grams with ArctiClean 60 ML Kit
Is it possible to overheat it by the cpu not being seated properly?
it's possible to overheat with the COOLER not seated properly, but I have doubts whether or not your computer would even turn on with the CPU being seated improperly. Just go onto Youtube if you need help with installation or applying thermal paste.
I would also say the the cleaning kit is a sham, cotton balls and 91% or more Isopropyl Alcohol will work.