i tried to flash the firmware... no good...
tried to switch the cables... no good...
tried to switch PSU... no good... (while my PSU is working perfect with the other S1)

btw, this one is quite different
the LED light is yellow
unlike the common S1, which is the LED light is green

and, when i started this S1 (yellow LED), the LED on the blade is not blinking
maybe the blade is dead? oh god...