Blinking question mark upon restarting
I was trying to wipe my Mac, and now when I turn it on it's a flashing "?".
I have tried turning it off and turning it back on with command R but not working.
Question marked as
We do not recommend erasing your Macintosh HD without reinstalling macOS afterwards, as this can destroy your Mac. If you try to trade in your Mac for a new one, and the old Mac contains no operating system whatsoever, they will reject your request.
Also, I see you're having trouble accessing macOS Recovery after having to erase your internal drive. To reinstall macOS, you need to enter macOS Recovery via the Internet; this can be done by pressing Cmd-Option-R on the keyboard during startup. See https://support.apple.com/en-us/HT201314 for more information.