Radio installation problem

I am trying to put a new Koss MS2015 radio/cd player in my 1992 Miata.
I have connected the power leads to a 12 volt pair on the car but the radio
does not power on.
The ground is negative. The wires from the car are hot (checked with a
meter) and the connections are firm.
I have pushed the reset button, all to no avail. So far as I know the radio
is not defective. I brought the first one back thinking that maybe it was.
The only thing I can think of is the lack of a ground wire to the frame of
the car. But doesn't the black wire provide a proper ground?
I have not at this point attached the speakers or the antenna. But the unit
still should power up without them, no?
Appreciate your advice

--
There is nothing wrong with having nothing to say unless you insist on
saying it.


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