I am not an electronics person, but very much interested in doing small projects myself. I wired an invertor cirtuit to convert 230V AC to 18 V DC for powering a 18V 350mA Brushless DC fan. When I switched on power supply, the fan just showed a jerk but did not start rotating. When I rotated manually by pushing the fan leaves with power on, it started working continuously. Again when I switched it off, allowed to stop rotation and switched on power suppy again, the same problem persisted. Then, I disconnected the fan from the circuit, switched on the circuit to allow charging of capacitors, then switched off power supply and again connected the fan to circuit, it started rotating by itself (eventhough external power was off), continuid rotation for some time till the capacitor got completely discharged. Can anybody help me to understand what went wrong?