It really is as simple as holding down the "2"-key for a few seconds immediately after Ctrl+Am+Am to turn the Blizzard off, and holding down Ctrl+Am+Am for 10 seconds to turn it on, but if you need visual indications then when you reboot the computer you will see horizontal blue lines flicker across the screen for a second, indicating the Blizzard is active. If you need a clearer indication just look at the top of the Workbench screen to see how much RAM you have, if it's only the 2 MB built into the A1200 then the Blizzard must be turned off.
