Don't know
Select this option if you don't know whether this DMG contains mixed parts, and no other option matches. Select this option if you bought the unit unmodified from a third party source, like eBay, a flea market or a local game store .
No
Select this option if you know that everything in this unit comes from the same source, for example if you (or your parents :) ) bought it from a store in the '90s.
Yes
Select this option if you know that you or someone else has modded this unit and may have swapped parts inside it. Select this option if you bought a modified (such as a backlighted, case modded or prosounded) unit from a third party source.
Nonfinite
This particular option exists for units bought from Nonfinite/Nonelectronics.