Did you overheat the 360 at the end to melt the solder like it says in the tutorials? guess not. just remove/unplug the fans and turn on the 360 after a couple of minutes the 360 will start to over heat<the ring will show red on the left sides>. Leave the 360 for about 2 minutes and turn it off and let it cool. that way the solder will melt and repair any broken contacts. thats an easier way then using a heat gun.
for the 5000th f****** time, overheating WILL NOT MELT SOLDER.
to melt the solder, you have to reach 210°C/392F. By the time your system reaches that temperature, the case is a molten puddle on the floor.