Be sure to note the current positions. If you accidentally disturbed a few of the switches, but not all of them, the current positions will help you determine which to try. You could first assume you only disturbed one; that narrows it down to 6 or 8 total tests.

When testing, you don't need to power down the Mac (avoids hard drive wear from constant spinning up then down). Just adjust the settings and press command-apple-power on the keyboard to restart.

I too have a few of these adaptors and documentation, and might recognize the model if you post a picture or at least describe its basic features and construction.