PC not powering up

[Reymmer]

Hi guys (sorry for my English though),
I come to you because I ran into an issue I've never encountered before and which is rather annoying. Yesterday, I decided to open my desktop PC case in order to clean it up a bit as I received my new SSD. I've done this many times before and in 2 years my PC didn't show any issue like that. But this time it won't power up, I mean, not at all, no green led (although as far as I recall I've never had one).
Everything is plugged in, my PSU is working (passed the paper clip test), my power switch might be broken so I tried to short the power pins but still nothing. I even tried to clear the CMOS and still nothing. I'm a bit lost at this point and as MSI client service takes a life to remind, I'm asking you.

My rig:
Intel Core i5-4670k
MSI b85-g43 gaming
GeForce gtx 760 from MSI
Corsair cx600m

Thanks in advance.

 

[popatim]

The paper clip trick only powers up the PSU so you can test it. By itself, it is not a test. Did you measure output voltages?

 

[Reymmer]

The paper clip trick only powers up the PSU so you can test it. By itself, it is not a test. Did you measure output voltages?

No I don't own a multimeter but it would make sense that there is no power in this case. I hope it's the PSU though, it would be a pain to dismount the CPU.