@swickliff, if only 1 out of 4 LEDs is blinking, that is very strange. When power is applied to the ESC, the bootloader on each ESC channel should always start and blink the blue led fast for 1 second. after that, firmware execution starts. If LED is not blinking at first, then there is most likely some HW issue that prevents the ESCs from booting. I am surprised that one out of four LEDs is actually blinking.
Our ESCs are all tested during production (including spinning), but if you think that you received the ESC in a non-working state (it was not damaged after receiving it), then you should submit an RMA form for a replacement. https://www.modalai.com/pages/rma