My little Mini-ITX system froze and would only sometimes power back on, only to freeze shortly thereafter. The problem was two 1000uF 10V capacitors in the PSU which had developed bulging tops and ESR greater than 1 ohm. Replacing these capacitors brought the system back to life. It would not be a surprise to see more capacitors fail in these power supplies due to the small space the Mini-ITX form factor requires several very hot power transistors to be crammed into.
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