If the power light and all other lights are off, the adapter is simply not powered. Check the electrical plug or adapter. If there electrical connection is perfect but still the adapter does not respond, then you have some serious power supply problem with your adapter, and it needs either replacement or servicing.
A red or blinking power light indicates a failure of the adapter to properly initialize itself. The only thing to do then is to switch off the adapter, unplug it, wait some seconds, then plug it in again and switch it on. It will reinitialize. The power light should normally be red for some minutes and turn green afterwards.
At times, using the wrong type of electrical adapter causes the power light to remain red. Be sure to check that with your supplier's documentation.
