DirecTV Stream Boxes Not Working

I have two DirecTV Stream devices (not the new Gemini, the previous box).  One hooked to a Samsung TV the other to a LG TV.  During the night last night I noticed that the blue power light on the DTV box connected to the LG TV was on.  I assumed the box was getting a software update.  This morning I found that the blue power light on both of the DTV boxes is on but the green internet connection light is not on.  I attempted to use the DTV remote to turn on each of the TVs as I usually do.  Neither TV will turn on using the DTV remote.  I see blue flashing lights at the top of each DTV remote.  I used the Samsung remote to turn on the TV.  I see that the DTV box is attempting to reboot over and over.  I've tried unplugging both DTV boxes, waiting several minutes, plugging back in.  Neither DTV box will complete the start up process.  The box tries to restart but after a few minutes powers itself off and tries again to start up.  I have AT&T 1 gig internet service.  Every other internet-connected device in my home (phones, iPad, computer, printer, HVAC thermostat) is connected to the internet and working correctly.