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Something I say repeatedly in A4000 fixing threads is clean your A4000 PSU connector. Take a paper q-tip shaft (after removing the cotton) and peel it down until it fits in the connector or a very narrow pipe cleaner and spray it down with Isopropyl alcohol and clean the inside of the female connector until it's shiny. If you use a the Q-tip method when it doesn't come out grey after swabbing the inside of the pin give it a try. The connector on the PSU cable is much more difficult to clean.
Basic test is spray it down with alcohol, both surfaces and reseat it a few times. Unplug and let it dry and try to boot the system up. If the stability of the system is suddenly better or worse, you have an avenue of exploring.
Of the A4000 boards I've returned to life I always replace the A4000 PSU connector with a recap and use a gold plated connector, because GOLD JERRY, GOLD. The PSU connector is somewhat more difficult to replace but worth doing.
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