Macmini startup - three beeps - grey screen

When powering on, the fan starts and a few seconds later there are three long beeps and the screen never gets beyond grey. This has happened on a few occasions before, but was solved by 'resetting PMU' procedure. On one occasion it required several repitions of the rest, but now nothing helps.
Anyway around this?

Three beeps normally means a memory problem. If you get the three beeps each time, your memory is bad, and the work around is new memory.

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