Sounds like the ballast is toast to me. I believe you can swap a new ballast into those fixtures fairly easy. You'll have to double check but a Workhorse 7 or a Longhorse ballast might cut it so long as they fit into the fixture. On the metal halide fixture there isn't much room for afermarket ballasts, so you have to use the stock ballasts. I don't think this is the case for the PC fixtures and you can use a cheap aftermarket ballast.
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