What should I do if I see a '164-Memory Size Error' or '201-Memory Error' POST message?
These errors indicate an incorrect memory configuration. Run Setup by pressing F10 and check that the DIMMs are properly seated, are the correct type, and are HP-compatible. If the issue persists, remove DIMMs one at a time and reboot to isolate the faulty module, and replace the system board if necessary. (Page 2)
From the official HP Prodesk 600 G1 Small Form Factor PC manual, page 2
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