excuse me for having issues with our products.
The most likely case is that your modem has lost its firmware or that it has a damaged regulator. To test if the firmware needs reloading please short the number 9 (right most) pad to the shield while you plug in the modem. If this causes the modem to shine a solid red LED then you can load the firmware again using the modem tools. If the modem does not light up then most likely the modem regulator is damaged. In this case you will need to either send it back to us for assessment and attempted repair or to order a replacement unit. As a note the regulator is very sensitive to overvoltage so it is important to check that the supply is capable of suppling the required voltage and current 5V 1A for peak operation and that it does not generate transient voltage spikes, as these can damage the modem regulator
Have a nice day and please stay safe