A board on the VMEbus has encountered a severe error and asserted the SYSFAIL signal which turns off HIGH POWER. The watchdog timers on the CPU boards assert this signal and light the SF LED if severe software errors occur. Check the SYSFAIL LEDs on the front edge of the boards. The board which has failed should light its LED. Restart the system. Verify proper seating of the system boards and correct device connections to the boards. Test the system with as many boards removed as possible adding boards back in until the problem board is identified. If the problem persists contact Adept Customer Service.