So 0102 is XBox 360s way of saying “I dunno WTF!”. Word on the street is that solder cracked between GPU and main board. To fix this, we need to apply more pressure between the GPU/Heatsink and the mainboard and the melt the soldering to make a connection again. The end result is that hopefully with the additional pressure, the solder will be less likely to crack in the future. All this is probably easier said than done, but should take the average Joe about an hour to accomplish. Vids to show how it’s done after the jump.
You can buy and X-clamp kit for around US $15. But I will be paying my local hardware store a visit first.