When I enter this code ‘’ Blynk.begin(auth, ssid, pass); ‘’ , the display turns off

[PeteKnight]

It’s a pity you didn’t take my previous advice….

@PeteKnight

I’d suggest that you start a new “need help with my project” topic and provide ALL of the information that is requested when you do this, along with details of the type of OLED display you are using and how it is connected to your board.
I’d also suggest including your serial monitor output, formatted with triple backticks in the same was as when you post code.

because then we’d have some useable information to enable us to help you.

Pete.