Ultra 2 Plus won't boot - support case #18604734

I just bought the same unit at Frys Sunday and it was working fine Sunday night with just 1 2TB disk. I too upgraded from 4.2.17 to 4.2.20. It rebooted fine, and I ran some tests copying about 80GB of Acronis images to it (on Gige was about 40% slower than my existing QNAP 219+). I then shut it down (via the GUI) to install drive #2, and it has never booted since then. The manual boot sequence works up to the point where you must press reset again to select the choice but it never does anything. I have tried cold starts (unplugged for 30 minutes) no-disk boots, new disk boot (pull first one), etc. to no avail. It will go back to Frys tomorrow. I just returned the Duo v2 (purchased last Monday) for almost exactly the same problem (no firmware update, but after maybe 5 reboots it was history - submitted support ticket, told to return it) to get this one. I guess I will have to order my second QNAP 219+ instead. If ReadyNAS units are this troublesome, I can't use them in my home office. I wanted to like it, but I've run out of patience.