First off, if you want us to help you for free, stop acting like an entitled little brat. Why are you even asking us for help if you took 5 minutes to decide to give up and return it all?
Second, €14 for troubleshooting by a certified computer service professional is cheap. I'd gladly pay that if I needed it. Way to utterly dismiss someone's choice of profession, by the way. Classy. (A hint: certified professional =/= enthusiast/hobbyist.) Oh, and presenting a non-specific PC troubleshooting session as a 5-minute endeavor just makes you come off as stupid and arrogant. I'd like to see you do the same if you had the parts available, in a way that's both safe and thorough enough to pinpoint an error. Of course you might get lucky and the first component tested might be defective. Or it might be some obscure incompatibility where no parts are actually dead, but somehow they just don't work together. That happens too, and is definitely not a 5-minute problem. If you're so sure it's simple, why not just order a set of spares, do the troubleshooting yourself, and return what you don't need?
Third, I love how you're ranting about everyone but you being incompetent sh*ts and go on to say you'll be ordering a Z170 motherboard with a Kaby Lake CPU. You're aware you'll most likely need a Skylake CPU to perform a BIOS update on that board, right? Or are you somehow psychic and know that the specific board you're getting is updated from the factory?
The attitude you're giving off in your posts here strikes me as fundamentally incompatible with the patience and care required to build and troubleshoot PCs. Have you considered buying a PS4?