Hi Ryan, Thanks again for your reply, and I appreciate your help with this, given that this clearly isn't a problem related to my ASUS hardware! Though you'll be pleased to know that yesterday I replaced my MSI graphics card for a new ASUS Strix! Anyway, as for the issue at hand, I have run /scannow - clear. Win 10 updates itself automatically these days. I use GeForce Experience to keep my graphics driver up-to-date. I'll look into using Intel's driver tool and see if that throws up anything. I recently installed CCleaner and have done a little bit of house keeping with that, but I'll pursue it further. I have Norton Security installed and rely on that to keep malware etc. at bay. Norton is giving me the all clear at present. I'm happy to leave this problem here for now, although I shall continue to see what I can do to fix it, but my machine is running OK and I can get my work done. I'm managing Sleep Mode manually for now, and I can get by with that. Picking up on my original post, you might be interested to know that a couple of days ago I re-flashed the BIOS again back up to the latest version 1402, just to see if it might fix the problem - it didn't, but it did reintroduce the "booting into BIOS" problem that started this thread! But I'm not going to worry too much about that (if I have to go back to version 0802, I will do) but it's interesting that flashing the BIOS to version 1402, is clearly introducing this problem. Allan.