[mashek]

View the discussion towards the end of this page of this thread, as the symptoms were similar to yours:

https://forums.irixnet.org/thread-2867-page-6.html

I don't know if the Tezro and Fuel V12's differ, but the Tezro definitely does this switch during boot!

You were right.  When I connected up a CRT via DVI2VGA adapter, it showed the textport screen.

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I'm not sure if this is correct.  I suspected the monitor, so I connected it to my 2410F that takes just about anything, and it has 2 DVI ports.
Also, the 030-1726-005 board shows the testport.

Make sure your DVI cable is single-link DVI-I, ALL PINS (single link version, not full Dual-link version) for DVI.  If you try DVI-D cable you'll loose PROM screen.  PROM = DVI-A, Irix OS = DVI-D

DVI-D & DVI-A = DVI-I

Otherwise I'd wipe the NVRAM somehow buy using a Fuel to overwrite your L1 RTC Dallas chip to reprovision for the Tezro.

That is interesting.  I will have to figure out which kind of cable I was using.  The Dell 2410F I was using has a DVI-D port and a DVI-I port.  I tried both, so I am guessing the cable I am using doesn't have the analog pins.