It is interesting that you have found what I said quite some time ago that the WSoD was caused by the video sub circuit not being able to sustain high frame rates and/or over driving.
Also if you had said you had changed boards - I assumed you had just opened the unit to get at the serial plug - I would have said to check that all the cables were seated solidly. It is one of the first things that my techs learn or they don't continue working for me.
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