Hey everyone, noob builder here. In the middle of my first build (see current assembly at bottom of post), and I decided to do a boot check after installing the cpu, cpu fan, and ram. I hooked up my power supply and booted, only to get post code 55, memory not installed.
 
I verified with the booklet that the memory was installed in the correct slots. I attempted booting with one stick in each individual slot, and I did this for each stick of ram. I also uninstalled the cpu fan, uninstalled the cpu, confirmed that there were no bent pins on the motherboard, and reinstalled the cpu. Still getting a code of 55. I'd also like to note that yes the ram is clicking/locking firmly into the slot.
 
I'm not sure what to do next. My first thought was to borrow a stick of ram from a friend to rule that out, but they all have DDR3, not DDR4. I've found similar issues online, and advice I've seen is to update the bios and/or update the settings for the memory within the bios, but I have no clue how to get to the bios from this point because it won't even boot that far.
 
I'm really worried that my cpu, ram, and/or motherboard will need to be replaced. Any suggestions/troubleshooting help would be greatly appreciated.
 
So far I have put together:
-Z170 FTW
-Intel i5-6600K
-Crucial Ballistix DDR4-2400 (2 x 8GB)

Yeah I have tried that. Still getting status code 55.

Hello and welcome to the forums cjkmpf!
 
I'm sorry to hear your new build isn't going so well. From what you've done so far, I suspect it could be a few things: Faulty a grounding issue, faulty memory, or faulty motherboard. While a bad CPU can happen too, it's very, very rare and far less likely than the other three possibilities. 
 
Before we get into that though, check one thing for me. There's a 3 pin header in the upper left corner of the board labeled J13. If you have a fan on that, remove it and see if the system POSTs. 
 
If you're not already testing outside the case on a piece of cardboard or wood, I suggest giving that a try before anything else just in case there's some odd grounding issue happening. Other than this, since you can't borrow any other DDR4 to test with, your only other option would be to RMA the board and see if that does the trick. 

You are using your cpu without any heatsink on it?!??!? ABORT ABORT ABORT!

Maybe a post check is okay, but, I wouldn't chance that for anything. Do you have an old power supply you could try? Also, are you hitting the cmos button while the machine is running? and, super dumb question, your keyboard is plugged in right? haha You should be tapping the delete key like a mad man.

No other power supply I can try. keyboard is plugged into top left usb slot on the back of the board, and yeah I'm spamming delete but have been unsuccessful in getting into bios even once.

That would have been the one and I also just noticed that Jaeson brought that up earlier.  If you still have any non essential parts installed, remove them.  
 
Otherwise I'd recommend RMA as Jaeson suggested.

Yes, you are. Ideally you'll do slot 1, then 3, then 2, then 4. It's sounding like you may have multiple problems, both bad RAM and either the board or CPU. Since it's much rarer for a bad processor, go ahead and register your board th en call us at 888-881-3842 or email support@evga.com and we can help get an RMA started for you.