Hello everyone, after receiving a lot of help from friendly people on this forum, I thought I'd share a little insight of my own. I have two desktops and a laptop, talking to each other in a miniature network. I noticed that, when shutting down one of the desktops, it didn't seem to really shutdown - there was still power on the USB ports, although the PC wouldn't wake up from mouse movement or keyboard input. Sort of super-hibernation. Being politically on the green side and worried about climate change and wasting energy, I tried everything I could think of and everything other people in various forums had already thought of to get the beast to really shutdown, which was, basically, trying out all combinations and permutations of enable/disable fast startup, enable/disable hibernation, enable/disable sleep mode in Control panel --> Power options --> System settings; and shutdown/shift-shutdown in the Start menu. Trying this out took some time, I can assure you . Nothing worked; the USB ports stayed under power no matter what I did. Then it occurred to me that the UEFI/BIOS might have something to do with this. Lo and behold - when I disabled all possibilities to power on on some signal or other there, things finally began falling into place, that is, they began to act like they should. In the table attached to this post I've summarized my findings for this scenario, i.e., when all automatic power-on options in the UEFI/BIOS are disabled. This means that the setting of hibernation and sleep mode have no influence on how shutdown and shift-shutdown behave, but that the setting of fast startup does, IF wake on whatever has been disabled in the UEFI/BIOS. If that wasn't the case, my PC wouldn't really shut down, no matter what combination of settings I tried. Well, I might be the last person on earth to finally understand this… but who knows, maybe there's some other poor soul out there, wondering how to really shut down his or her PC. Let me tell you: it might have to do with your UEFI/BIOS. By the way, I haven't noticed any great shortening of bootup time with fast startup enabled. In my case, enabling it shaved six to eight seconds off a total boot time between 1'23" and 1'31", depending on when I consider my PC to have finished booting. That can be quite some time after the welcoming jingle, I've found. Regards, Jaap.