I know this will sound weird but try the power pins on the opposite mobo pins (+ to GND, - to +). I've had cases where the pins were switched. Your PSU is obviously working or the LED wouldn't function however I've also had cases where a mobo wouldn't power on if the CPU wasn't seated right, but if you've already done all of the heat piping, thermal compound etc then don't take all that off until you've exhausted other possibilities. I like the design of that case, very neat. Another thing, try unplugging power for both the optical and HDD and see if you get video...are you certain that the Wesena PSU (I'm assuming the 80 is 80 watts) has enough power for an i3 + mechanical HDD + BD drive??
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