Aurora R16, 4060, not turning on

Hi, I recently have been away for a month I’ve come yesterday to turn my pc on and there is nothing at all happening, have tried the power down suggestion

have tried 3 different plugs and sockets 

all I get on the back of the PSU is a green LED light below were the lead goes for about 5 seconds then goes off

i I have opened it up and done the other suggested tests like unplugging things individually to identify what could by cause of it

still nothing, anyone experienced this? Do I need to install a new PSU ?

I’ve since disconnected the PSU gently and removed it entirely from the desktop plugged it In and get the same light

Warranty expired on the 22nd conveniently

i have some basic knowledge of parts I can install a new psu just wondering before I go buy it is there anything else I can try or have suggested ?

bit annoyed to be honest by this worked when I left

for the months stops after warranty and on my return