I got a new msi z270 gaming m7 few weeks ago. The case hadn't arrived yet so I installed the cpu, cooler and ram on to the motherboard and turned it on to see if it works. It worked fine and I would go directly into the bios. Everyday till I got the case, I'd turn the motherboard on without any monitor and keep it on for few minutes (For no reason). On few of the boots it would turn off after 10-20 seconds. I'm guessing I got this error but didn't realize since I didn't have the monitor connected. I got the case today which is nzxt h440. I installed the motherboard into the case. Connected the fan hub and then turned it on. I did not connect any usb device nor did i connect the case usb connector but got the error. I did connect the mouse once to check out the bios before i got the case but it still worked afterwards.