The AC-AC PSU in my SVI-328 appears to have developed some kind of fault. When the computer has been on a minute or so, the transformer begins to buzz louder and the screen becomes corrupted. Powering down and up rectifies the situation for a moment but repeats again after a moment. With my other Spectravideo PSU this doesn't happen so I'm pretty sure it's the PSU that's having issues.

As an AC adaptor it is basically a transformer outputting 16 and 9 VAC. The DC circuitry is within the computer. Is there something based on the symptoms that could be addressed?

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