Yes he did as the reported problem, and the problem observed was :
"It powered on, showed sync, but no video at all."
Nothing what so ever on the CRT. No flicker of anything, until:
"As a last resort," said Max, "I hit the manual degauss button and was rewarded with colours, strange colours in a bizarre pattern."
Using the built-in degaussing coil on colour CRT monitors does NOT cause the picture to stabilise - it does the opposite. For the few seconds it operates the alternating magnetic field generated from the degaussing coil disrupts the fields from the scan coils causing short, gross picture instability.
What it certainly does not do it cause a non-existent picture to come back - unless there is genuine PSU fault in both monitors that for some mysterious reason does not occur when tested elsewhere.
Only when the picture does "magically" appear does it then reveal the presence of a strong permanent magnet via the usual expected symptoms. However, then finger of suspicion for the everything, including the reported problem of "no picture", is quite firmly pointed at the magnet. Which is complete rubbish.