My wifi router, doesnt power up, but it has its power led on.

Today i left for work with my router was working, when i returned i notice that my wifi was off, i check my router all led were off with exception of power led... i did chek my pc via ethernet, and it wasnt connecting any...neither the led of ports were working.... i press my reset switch did not reply.... i did another attempt by unplugging the power cord, and it rebooted showed all led light testing and after that went only the powe led on only....i disconnected the cable ports including wan, tried to reset again and nothing... then on 3rd a attempt i saw that  after 2 minutes it reboot by it self.. and returns to solid power led and everything else shut. No coms via neither via wifi or cable... i dont know  what is a route cause, but i suspect an automatic update that went wrong, and this router was bought 2 months ago