True, that Micron isnt a retailer as such in the old days you may have seen some Micron or Samsung branded stuff around but these days companies like OCZ, Corsair, Crucial etc buy their chips, speed rate them and put a fancy heatsink on so that you cant see what chips are actually on it.
You cant really conclude what chips you have on yours just by going off the voltage though, especially with the PC8500 or 1066mhz RAM, as its just overclocked PC6400 or 800mhz RAM. I have 1066mhz Crucial RAM with Micron chips with a stock voltage of 2.2v
All chips are diffferent and will all take a different voltage to clock from 800mhz to the 1066mhz so the companies set a limit for warranty and try to clock the RAM up to within PC8500 within that threshold.
I have some 1066 g.skill RAM here thats rated 1066mhz at a whopping 2.3-2.4v... which is pretty high, but i'm guessing its Elpida RAM and its guaranteed for that speed at those voltages so i dont care as much..
You're right about the manual, by the time you get the board its already out of date and is only fit to wipe ones ass with...

Now if Mem-*test*-('") passes we have to look at other things like Hard drive etc.. If it does throw up errors try 1 stick in slot 1 and run -*test*-('") 5 and -*test*-('") 8 about 10 times each.. -*test*-('") both sticks individually to determine which one is at fault.. Or save yourself some time and return both and get some different RAM.
One of the most frustrating things in a build is having bad RAM, black screens at startup, incessant beeping, blue screens in windows etc etc...I Know how you feel mate, but I'm sure it can be sorted out.