The one thing it doesn't look like you've tried is changing out the actual cabinet. I had an OS7200 that had a bad cabinet that caused all kinds of weird problems.

I would suggest going in after hours and putting in a new cabinet. I'm really surprised tech support did not suggest this. Do you receive tech support directly from Samsung or from your distributor?

Oh and your second to last sentence was not necessary. It may be a problem on your system but not everyone that owns a 7200 has issues like these.

Agreed. Most people here are either Samsung techs or actual owners that have the Samsung line, so throwing out comments like that won't gain you a lot of help.