PSU works on another system
Can't test the RAM, but that's irrelevant as nothing happens even when it's taken out of the system.
I do not have access to a similar board with a LGA 1155 socket, so I can't individually test either of them.
I connected the Power Switch from another system to see if the switch on my case was faulty, but it also didn't work.
PROBLEM / INDICATIONS
Standby LED on MOBO lights up
Other diagnostics LED's on board don't light up
Besides a slight twitch (not even a 1/4 turn) in the video card fan when pressing the power button, nothing happens. There is no sound, no movement, no noise, nada.
Note that I started with everything inside (including RAM, video card, SSD). Have been working one step back everytime removing a single item at a time until I was left with nothing but the MOBO, CPU and PSU.
Asus Sabertooth Z77
Corsair TX650 (tested and working)