You have to switch the OPR/SVC button back to SVC before you can turn it back on.

As for special procedures for turning it back on, there really aren't any. The "SELECT" and "MENU" button combination on the front panel is a system reset, which is called for after installing the firmware, but it's not actually part of turning the unit on.

Loosely related to the rest process, pressing "SELECT" and "INPUT" on the front panel at the same time while the unit is in standby displays the version number on the front panel display.