YLOD Repair not working?

jlmcbmoo, here is my answer from a similar question. "First you do need to remember that this will only work if your YLOD is caused by solder fractures and if they are not to extreme.The YLOD is generated by cracked solder connections on the CPU/GPU. Reflowing any board with a heatgun, and even less with a hair dryer, is not an exact science and as such does have a certain amount of failure. One more important thing to remember is that a hairdryer will not generate enough heat (check on here Hair dryer for logic board reflow? for an explanation) to melt any solder. The proper fix for this would most likely be a professional reball. Anyhow, the biggest reason for failure to reflow is not enough consistent heat. There is a fine line between reflowing and absolutely melting the solder, so one needs to be aggressive without going over board. If nothing else, get a couple of temperature probes and see what heat you generate. You also need to make sure that you apply the thermal paste properly etc. If at first you don't succeed....:)." This guide will show you how to apply thermal paste. Hope this helps, good luck