What will happen if I reversed electrical polarity of my LCD's power by mistake?

Question

I bought a used LCD monitor, I unknowingly plugged in (+) --C-- (-) but it should use (-) -- C -- (+) so obviously it didn't power up, what would be happening to its own circuitry? Fried?

I do have another fitting adapter with right polarity but it is over-rated by voltage/wattage/amp, it was only a test since that belong to another device.

Answer 1

I would normally expect that this would not damage anything. There should be protection circuits to prevent damage, but who knows?

Plug it in the right way round and see what happens.

Edit.
For the other adapter, over rating amps and watts is O.K. But too high a voltage rating is bad.

Answer 2

Hmmmm... The only way to know for sure if that fried the the circuits would be to try it out with the correct adapter.

I would not use the adapter with the overrated voltage, why risk it further?

Just take the one you originally used, cut the output cable and splice the wires together the opposite way to reverse the polarity of the plug. That would solve your problem.