Not using VMware or virtual box are you? Disable this see if it helps.I haven't messed with this stuff for months, and got a new pc since then, and now having a dog of a time getting access to trinketboot. I'm using the same usb cable that worked previously so I assume that the issue is the new usb ports? I can get the trinketboot drive to appear but it vanishes again instantly, so I can't flash anything to it. Very frustrating.