Default sketch working but arduino is not recognizing
Hahaha! I figured it out! The USB connector on the board's side was loose connected! It didn't felt like more pressable &amp; when I pressed it enough, it firmly fitted.

When it loose connected, the board connects power only.

The drivers were installed automatically &amp; it showed under COM6. I've got sketches running in no time.
I' ve tried a lot of knight rider patterns with a bunch of RGB LEDs then ;-)

Thank you @Majenko and the arduino stack exchage for your kind replies.