Ok guys heres the problem, I've been fixing Xbox's for quite some time now but recently I've come across a few arcade models that just wont hold the fix for longer than a few hours. Tried most variations on the fix including screwing the board and case together to keep the board straight putting rubber under the chips etc, etc. Anyone with any ideas on this I would appreciate the info to try myself. Big difference that I can see is that the bolts ***** straight into the heatsink now as opposed to screwing into the x-shaped outriggers which I think may have allowed more movement in the boad!!!