You don't tell us what make / model you're asking about, so we can't give specific advice, but it sounds like a power supply problem. If your "new power cord" is instead a DC power supply, check that the rating is correct for your instrument.
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You don't tell us what make / model you're asking about, so we can't give specific advice, but it sounds like a power supply problem. If your "new power cord" is instead a DC power supply, check that the rating is correct for your instrument.