If the PIDU Power LED is blinking it means that there is a short circuit in the ODU cable.
Action: Remove the ODU cable from the PIDU. Check that pins 4&5 and 7&8 are not crossed with pins 1&2 and 3&6. Check that the resistance between pins 1&8 is greater than 100K ohms. If either check fails, replace or repair the ODU cable.