Vostro 3700 overheating

I bought a Vostro 3700 i7-720q used on ebay. After I bought it I found it would freeze. I eliminated everything I though it could be (i/o conflict, drivers, etc) and nothing helped. This was probably the reason it was sold on ebay. I noticed how hot the machine and fan got. I researched upgradeding the cpu to an i7-940xm and when got the chip planned to put in best thermal transfer to solve the freezeup problem I conculded was due to heat. I thought to be Powerstrate xtreme to be the best thermal transfer to use during the cpu switchout.

I pull the heat sink and its obivous why my machine was hot. The thermal past was a crummy job. I cleaned off heat sink with arctic Ice cleaner, put powerstrate xtreme on cpu and replaced the cpu with a i7-940. Boots up and has been running fine AND it is soooo much cooler.

Getting to the heat sink IS NOT an easy task in the Vostro 3700 - I love my Vostro 3700 BUT it is a very delicate task to remove the keyboard, palm rest and base in order to get to the motherboard and heatsink. I wouldn't do it again.