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If no LEDs are blinking on powering RPI does it means Razberry 7 board is defective?

My understanding is that Z-Wave.Me firmware will blink the LED when the application layer firmware starts running. There's a chance the board is not dead, but simply has bad firmware. You can try to reinstall the Z=Wave.Me firmware over a serial port by following the instructions here: https://z-wave.me/support/controller-tools/

Note that you'll need a TTL-level USB serial adapter (set to 3.3V) to connect your PC to the Razberry 7 pins. Connect power (pin 1), ground (pin 6 or pin 9), Tx (pin 14) and Rx (pin 15), where Tx connects to Rx on the serial adapter and Rx connects to Tx on the serial adapter. Something like this: https://www.amazon.com/WWZMDiB-FT232RL- ... B0BJKCSZZW

If you do not see communication on the serial port from the Razzberry 7 card, then you likely have a dead board. There are many reasons this can happen such as flashing with non-Z-Wave.Me firmware (Z-Wave.Me uses a custom bootloader), exceeding the 3.3V power and a defective board. Recovering from a bad bootloader can be done, but it requires a special tool: https://z-wave.me/manual/prg/#ProductDescription

Sometimes it could be a power issue or a loose connection.

After changing RPI board, my Razberry 7 Pro works as it should.
No LED turned ON / blinking is OK.