Probably the weirdest issue you'll see today.
All of my parts (BRAND NEW, EXCEPT FOR GPU) worked perfectly fine, OUTSIDE the case. I've used the PC like that for at least 10 hours, until I attempted to install it inside the case.
All I did was screw in the motherboard and psu, connect all the cables and jump the pins with a screwdriver. No life. Took the motherboard out of the case, and tried again on the motherboard's cardboard package, no life. Took out all parts except for the cpu (yes the cooler is connected) and ram. Or even without ram. I've reseated the 8 and 24pin, the battery, everything (a hundred times). I've tried with all the rest of the parts. I've tried everything. I've asked many people and they all come to the conclusion that it's ''strange''.
One thing I have to note is that the standoffs were pre-installed for ATX, and I've got a micro atx board. The result was that I missed 2 standoffs, but the mobo still didn't touch the case.
What's possibly going wrong? If a part is dead, is it the mobo or the psu? I'm thinking it's the mobo as that's the only part I was actually moving. But how..? What did I do wrong? This is my first build, and it's quite saddening to start this way.
cpu i3-6100 stock cooler
mobo Asrock b150m pro4
ram 8gb corsair vengeance single
psu xfx xt 400 bronze
ssd crucial 240gb
case phanteks p400s
gpu gigabyte gtx 460 (I know)