Tektronix Phaser 780 won't start up or initialize. Just hear humming so I know it's getting power. Control panel is completely blank... please help! Thx LM

Bad formater or bad LVPS

That normally indicated a heating issue with the print head. Could be the printhead itself or an issue with the electronics module providing the source voltage for that heater

That is a black ink stick count failure.
It is not seeing the black ink stick.
See if a stick is broken or not in place. One may be twisted or just jammed.
Outside chance you would need an ink loader because the sensor is not detecting the ink
Check the black sticks see if you can clear it by moving them around or sliding them up and out and reloading.

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It is a print head tilt error.
Most likely ink is in the stainless steel pivot block at the bottom of the print head.
Also the printer could have been unplugged and the cleaning blade is stuck to the print head.
Or a cable is binding the print head movement.

Most likely a bad print heat. One of the ink heaters is overheating.

There is a flag sensor on the registration assembly that is possibly broken.

Not a problem, but turning it off causes the machine to do a setup, which then purges the ink supply and is very wastful.