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Level N
worth a shot changing the PSU. he's already got a new UPS anywayExpecting a basic tier psu to last more than 4-5 years with such heavy usage in itself is quite an assumption. Whether mobo/ram is faulty or not you should get a new psu as in worst case it will be helpful in your new system(no point getting or repairing mobo for such old system) & in best case it may save at least your hdd from failure/data corruption.
https://www.vedantcomputers.com/pro...650-650-watt-80-plus-bronze-certified-atx-psu