Hi all.

I have been having a recurring problem of my PC locking up, with a pink tint to the screen. I have to hard reset.
I have tried everything I can think of including:-
swapping GPU's, swapping memory, running at stock, updated all drivers, formatted and re install, different AMD driver/CAP combo's............ 
system has passed memtest86+ (2 passes) and Prime95 (2 hours) and also tested each HDD. Graphics cards have been burned in using kombuster DX11 @ fullscreen for 30 minutes. 
It only appears to happen in Battlefield 3 but I haven't played any other game long enough to really test.
I'm almost certain it's crossfire/software related as if I play windowed or disable a card it has yet to happen, although as above, haven't really played long enough to test.
I would appreciate your valuable knowledge. Especially if you have seen this crash first hand.

Screenie here:- http://api.viglink.com/api/click?format=go&key=5c397904ad065808129a1f6e358bba53&loc=http%3A%2F%2Fwww.computing.net%2Fanswers%2Fhardware%2Fpink-screen-lock-up%2F86730.html&v=1&libid=1344859409661&out=http%3A%2F%2Ffbcdn-sphotos-b-a.akamaihd.net%2Fhphotos-ak-ash4%2F333096_10151152579423923_2132178241_o.jpg&ref=http%3A%2F%2Fwww.computing.net%2Fforum%2Fhardware%2F1.html&title=Pink%20Screen%20Lock%20Up&txt=http%3A%2F%2Ffbcdn-sphotos-b-a.akamaihd.n...&jsonp=vglnk_jsonp_13448597364673

Thanks in advance.

Phenom II x6 BE 1090T @ 3.8GHz 1.40V
Asus Crosshair IV Formula
8GB GSkill Ripjaw @ 1333 7-7-7 1.60V
HIS Radeon HD6850 IceQX Turbo 1GB CrossfireX
OCZ Vertex+ SSD
2x WD Blue SATAIII
CM GX 650