You will need the following.
1. Spacers for under the motherboard to allow air flow underneath it.
2. An aluminum heat shield, a pie plate works
3. A heat gun capable of reaching about 450 degrees.
4. The defective motherboard.
5. A timer, a cell phone will do.
First run a time test. Set a piece of solder on a metal surface and with the heat gun one inch away from it see how long it takes to melt the solder. In my case it took 3 minutes. Set the motherboard on the spacers and center the heat shield over the GPU chip. In the picture above it is the left green chip located just above the center of the arc where the cooling fan goes. Start the timer and hold the heat gun in place moving it slightly to heat the top of the chip evenly. After the timer runs out let the motherboard cool slowly, like for 30 minutes before handling it or reassembling it.
Reassemble everything and hopefully you now have a working laptop! So far this has fixed every motherboard that I have tried it on. This fixes problems like CD ROM drive not recognized, No sound, garbage on screen, etc.