Yellow Light Of Death Repair Problems (Heat Gun)

My dad and I were trying to fix my PlayStation 3 YLOD problem. We did not purchase the kit and used tools at home to substitute for the tools in the kit. Instead of the heat gun, we used a hair dryer. When we put the playstation back together it didn't work even though we followed each step carefully. Is it because we used a hairdryer and it might not have been as powerful as the heat gun? Also, should we try again and heat the thermal pads for a longer period of time? Please answer ASAP.