In the manual there are instructions to do a restart from power failure:
"Power Failures: During an accidental power failure, a soft version of a Breakpoint is set where the current parameters and coordinates are automatically saved by the system. This information will become available to resume at the next immediate start of the machine. The information is not saved permanently, thus if it is not resumed at the next start of the machine, the information will be lost. When power is returned to the machine, perform a HOME operation. Afterwards the Want to Restore prompt will be displayed. Press OK to restart the unfinished file operation. If the operation is Canceled, ability to resume from the saved location will be permanently lost."