Stargate monitor not working

Today I turned on my Stargate machine, and no more monitor. Sound,
buttons all work, just no picture, just black. I haven't recently
moved the machine or anything, it just worked one day and then not the
next.

Do I need a new monitor? Are these things replaceable/repairable? Or
could it be a different problem? I don't really know where to begin.
.

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