My motherboard has been working fine for a month or so on a new build. After an MS security update, a firmware update occurred (but unfortunately I didn't catch what it was, I just said yes, my mistake) and it seemed to go fine. But now I have a problem with rebooting. The machine powers up and the fans go on, but nothing happens. This is from a cold start or when I reboot via Windows 10. If I manually power down the machine, and attempt again (sometimes it takes 4 or 5 tries), it finally boots and works perfectly. I have reset to optimum defaults in the bios, but that does not solve the issue. Any suggestions? It's driving me nuts. I am not an expert at these things. Thank you.