New
#11
Ran memtest again last night, this time with all 4 sticks, and it went through 4 full passes with no errors (it was on the 5th when I stopped it). I did contact Dell and it turns out I have another year on my warranty (had forgotten that I bought that). I'll work with them to try to resolve this, but will update here as needed.
I'm kind of wondering if one of them was just seated every so slightly off and when I put them back in (after blowing all the dust out) it maybe corrected things. Things went fine yesterday afternoon, after I put all 4 back in the computer. No BSODs or anything. It usually would have throw one in that time. We'll see.
Thanks again; the help was greatly appreciated.