Can't run code without USB connection

[PSzcz.2]

Hello, sorry for asking this but I'm new to operating STM32 microcontrollers and the IDE it came with. I wrote a simple code to read the pin state and write to an LED once detected. All runs well on debugging. The problem for me is that when I unplug the USB connection (the board is powered through a power supply) the code suddenly stops and no LEDs light up after the button is pressed.

Is there a step I'm missing like compiling to memory? I've spent some time looking for an answer but sadly I got no luck in solving this.

If possible, could someone lead me towards finding a solution for this? Thank you :)

[PSzcz.2]

I forgot to mention I am using a STEVAL-SPIN3204 board for my program. If that's any help.

[TDK]

Make sure you're compiling to FLASH and not RAM. This is usually the default.

Possibly the ST-Link is holding it in reset. Try removing J8.

[PSzcz.2]

Thank you for the information, with the connector now disconnected the program runs without the USB connection now too. Thank you.