I have 2 PCs, one main, one back-up. Upgraded both to W10 V1809 on the weekend just gone, both worked OK afterward. A couple of days ago, the main PC got stuck in the W10 "Shutting Down" screen overnight, and I had to do a force shut down. All attempts to startup since have left me with no POST and stuck on the Gigabyte splash screen. Cannot get into BIOS as there is no keyboard function. Cleared CMOS but no change. This morning, my spare computer started showing similar symptoms - stuck on the GA splash screen for a few minutes before booting. This was immediately after a W10 update. Any ideas anyone?