So all of a sudden, I simultaneously lost today: -front USB functionality, completely (can't see any USB volume; no working mouse or keyboard either) -rear USB functionality, partially (can't see any USB volume, but keyboard/mouse work) -bluetooth: not available. I used to use my trackpad, luckily I could find an old mouse to work with; -and above all, no starting volume choice possible with ALT key. No EFI boot accordingly. Keeps restarting on my Master volume: no volume to choose to start from. I have the Inateck KT4004 USB3 card installed which works very well, this is a good point. I could also find a Bluetooth dongle. But what bothers me, it's that I can't choose my starting volume (which behaves normally in Disk Utility). Tried another keyboard: same thing. Any idea on how to deal with is very welcome. Thanks in advance. My machine: see signature.