Update:

Well, after 3 calls to tech support, they're elevating it to level 3 support (or Tier 3, I think it's called).

In case anyone can benefit from this, here's the tricks they've had me use so far:

1. Press and hold the reset button for 30 seconds, then release and wait 30 seconds before turning on
2. Download the "Golden" Dingo software, load onto a USB, and then power it off, hold the Menu and Rotate buttons down while powering on, release after 10 sec, etc. This worked in that the software reinstalled, but the white screen remained.
3. I've loaded the software from the USB like 5 times- still no go.

*sigh* I hope they agree to fix it under warranty and pay shipping both ways.....