Update on a console from hell - fixed on Sunday 29Apr - (I hope).
Friend of a friend console (yea I know, word is getting around..) 3ROL, so I try my X-Clamp fix (standard), doesn't boot.
3 washers - boots but locks within seconds - checkboard.
2 washers - doesn't boot.
1 washer - doesn't boot.
GPU loose - doesn't boot.
CPU loose - doesn't boot.
NO washers - pressing hard on the centre of the GPU - boots ... wtf
3 washers - pressing hard on the centre of the GPU - boots ...
So with the board 'flat' it doesn't want to know with corner pressure - so how do I apply pressure to the die from the centre (and don't say X clamp

) as I wanted it to press down / not up...
My solution was to cut a 1mm thick piece of aluminium to cover the two dies (1cm x 2cm ish), heatpaste both sides + the normal heatsink and then bolt it tight with 3 washers per bolt.
3 washers = height of GPU case & die - so my theory is by putting a 1mm 'shim' on the die, I am forcing the board to flex 'down' (it's held 'level' on all the corners by the bolts attached to the case remember).
Worked a charm - I've given it a workout in COD2 for the last few hours - zero lockups of problems. I'm going to give it a few more days before posting another success in the polls - but it's looking promising ...
I'll update my tutorial with another option if she turns out good ..

Did you notice if maybe the GPU heatsink was bent? I read someone else had a GPU heatsink that was extremely bent (due to the xclamps) and he shaved it down so it was flat again.
Also, what I've been doing is adding small pieces of like sticky backed felt to the corners of the gpu and cpu for so the heatsink provides pressure uniformly around the entire surface of the GPU/CPU. Good/bad idea?
like that..