Well the whole reason I have the computer is that it won't start up unless you move a stick of RAM. If any memory stick is in a slot (and I've tried a dozen different sticks) for more than one cold boot the machine won't boot. It has a Gigabyte GA-Z97-HD3 MB in it and if you try to boot with no sticks you get a typical memory error (continuous beeping). Drop a stick in slot one and it boots fine. Reboot and all is fine. Shut down and start up again and nothing happens. No beeps, POST, screen - nothing but fans turning. Move the stick of memory to any other slot and it boots fine again until powered down. I dumped the RAID, reset the BIOS, installed Win10 on an SSD and the same thing still happens. It's a nice custom rig with a GTX 1080 in it so I ordered another refurbished MB per the customer request. I thought about a firmware/BIOS upgrade but this started out of the blue so I am assuming the MB is starting to have problems.