Hard to believe it's 8 units all failed exactly the same. More likely there's some operator error here, but hard to say what without more indication of how you are adjusting it (or not).
Some things it could be: sweep not being triggered; intensity turned down.
Set trigger source to line.
Set trigger mode to auto.
Turn trigger level up and down to see if a sweep (green horizontal line) appears. If not, try turning up Intensity.
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