Mini Pro works with USB but not power supply. Doesn't bootload?

Hi,

I'm working on a project with an Arduino Mini Pro 5V (ATmega328P) and multiple sensors/actuators connected to it. When powered through USB (with a USB 2.0 to UART TTL 6PIN Connector), it works perfectly fine.
However, when I power it through a 5V wall supply, the sketch is not working. The power diode lights up, but PIN 13 doesn't blink, suggesting that it doesn't bootload ? The power light on one of the sensors is also lit.

Any suggestions on why this is happening?

Thanks!

Are you connecting to RAW pin or Vin pin?