Dear all.
I just installed a new (but old of course) JBL MS8, but found situation
as follow:
- The car ground was not connected to the battery
- The MS8's remote IN was not connected
- Power (+) and (-) were connected
- The display cable was connected

then when I connected the car ground again,
the MS8's blue LED was illuminated forever, until the GND is disconnected.

But when the display cable was disconnected,
and the GND was connected again,
the blue ligh illuminated for a short while, then went off.

Is it normal ?
Any cure, or should I return the product ?