I just received my EQi12 1220P / 24GB RAM / 512GB NVMe, and it’s doing the same thing. If I plug in ANY USB peripheral (keyboard, mouse, HID dongle), the system hangs at boot. If I plug in a USB STORAGE drive (along with the peripheral), the system will post and boot (this works even with a card reader without any physical storage attached).
I’ve tried disabling XHCI handoff and all of the other USB options in the BIOS, and I’ve flashed the latest BIOS… I’d rather not have to have a storage thumb drive plugged in for this machine to boot; has there been a fix yet?