What are the steps to test the PSU in an HP Pro 200 experiencing Error 51.23?

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Grade: Education Subject: Support
What are the steps to test the PSU in an HP Pro 200 experiencing Error 51.23?
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The most reliable way is to replace the PSU with a known-good one of the same wattage and specifications. If the error disappears, the original PSU is faulty. Alternatively, you can use a PSU tester, but these can be less accurate and may not detect all PSU issues. Be extremely careful when working with the PSU; it contains high-voltage components.