Promini green light doesnt glow


Can anyone please tell me what does it mean if an arduino promini has red light switched on when power is connected but the green light doesnt glow at all? I burnt the bootloader and uploaded the code on promini and it worked fine. But after that, when I connected it on a pcb , only the red light glows but the green one does not. I checked all the connections and they are all connected.

Thank you