Why my bread board won't work if I pull out the USB/power cable?

edited March 15 in General

I have bread boarded two Nano modules both have their own NRF24L0 radio. Both boards work perfectly when attached to a computer USB/power port.

Both talk back and forth sending and receiving data. Works great.

However if I pull out the USB/power cable from one board and supply 9 volts to Vin .... it won't transmit or receive anymore. I plug the USB/power/communications cable back in and everything is back to normal. I've even used a 120Vac to 5Vdc adapter with a USB output connector and same thing. Won't Transmit/or receive.

Can anyone tell me why?

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