1988 Chevy Camaro My Camaro is getting no power; won't star

My car will not start. Disconnected the battery, and used a multimeter to see if there was a break in the system, so I connected it to the negative and poisitive battery cables and it beeped, meanign it wasn't open.

So I thought the battery must be dead. Hooked up the battery and checked the voltage, nothing. Took it to a Napa store and had them check it and they confired the batter was dead.

Got a new battery and nothing has changed.

These are the symptoms, they have stayed consistent through the change in battery:
-when key is turned, nothing happens, no sound, no lights nothing
-the inside light does not turn on when I open the door
-the headlights do not turn on
-the radio will not turn on
-with key in the nuetral position, nothing works. No radio, no windows, no lights


If it was the altenator, wouldnt the car start at least?
So I ruled that out.

Ignition switch? But still, wouldn't the headlights turn on while the car was off?
So I ruled that out.

When I attach the multimeter to either end of the disconnected battery cables, I get a beep, which means there is continuity and the circuit is not open. Does that suffice as a test to see if there is a disconnected wire in the electrical system?

I checked the fuses before switching batteries and they were all fine. I will check them again, but I can't see how a it could be a fuse if they were fine before the battery change.

Any ideas or helpful hints would be much appreciated.