Right, Just so you know none of these methods will work for long. (unless you get lucky, and the towel trick is very likely to fry your capacitiors.
I have my own part time games console repair business in the u.k.
The real problem with all x box 360, is combination of poor cooling and bad design. All leading to the common RROD and more.
The CPU and GPU chips are connected to the motherboard, not with a series of pins like a coventional PC, But they sit on a set of small "balls" of solder.( there are problems with the solder as well due to the new lead free manufacturing laws but thats a whole different story). In the manufacturing process the chip is set onto the balls and the whole board is heated till the balls melt and solders all the connections in the chip to the motherboard. (note: this method is also used to attach other chips on the board).
Now What happens is due to the poor design of the Xbox cooling system the chips get very, very hot...........hot enough to cause the thremal cut out on the board to shut the unit down. In some cases it will also melt the solder in certain parts and cause perminant disconnection from the chip.
The towel, x-clamp fix are all just variations of getting the chip to reconnect with the solder beads either through exerting extra pressure on the board, (xclamp fix) or to heating the chip up to the temprature that all the solder joints remelt causing the reconnection of all the points again, (towel trick).
They will all make reconnections, (working xbox) and in somecases this will work for the life of the "Box" but what normally happens is the next time you have benn playing for a long time, in a warm room the "(fix)" fails again.
The Only Real method of making sure your RROD stays away is to "reflow" the motherboard, now again there are homebrew methods on the net but to realy do it propely you need to use a Aoyue 720 IR workstation or similar to do the job. (at least without frying the capacitors) It can also be done with a hotair gun, capacitor shield and an IR laser thermometer, (however too much heat and to close with the gun and you will blow the Chip off the board!).
The termal paste is only to help the heat transfer from the chip to the Heat sink/fins and remelting this has sweet F.A to do with repairing the problem except if it is not replaced the heat build up that this causes. the problem reocurrence is much much quicker!
Get a pro to do the repair, and ask them how the repair is being done if they say anything else than "reflowing the chips" the motherboard then the chances are that they are a set of cowboys that will do a quick and nasty xclamp fix!
Any questions?

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