MSI Z170A, E0 post code after case swap

[Waved]

Hello,

I swapped my computer case today, because my old one was falling apart. I disassembled my system and put it in my new case and now I'm getting an E0 post code. I tried swapping and reducing the RAM, but that didn't help over time (see below). I did NOT remove the CPU or it's heat sink, so no possible error there. I checked all the PSU cables on both ends and tried swapping or disconnecting my CPU fans as well.

 

I got it to boot with one RAM stick on Dimm1, ran a cinebench and furmark test, shut it down, installed all 4 Dimms, still worked, tested everything again, rebooted, same error.

I can get into the BIOS by clearing the CMOS, but only for this particular boot. After leaving the BIOS, there is the E0 error again.

 

Maybe one of you can help me!

 

My system:

MSI Z170A gaming titanium edition

Intel Core I7 6700k

Zotac GTX 980Ti 

64gb Geil DDR4 RAM

Corsair RM850

New case: Aerocool Scar