HP UPS R1500 Generation 2 - Clicks - Not Starting

Dear Colleagues,

I have bough a brand new HP UPS R1500 G2 and I tried to set it up. On the first connection I only hear clicking

noise continousy.

If I press the start button nothing happens and the clicks continue

I do not seem to start the **bleep** thing. Any idea what is going on?

Is the unit faulty at all.

I tried everything and I am sure the input power is okay and nothing is missing.

Your help in this matter is much appreciated.