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Computer won't start, no action at all.

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OH Smeg

Unplug the Mains Lead leave it a few seconds then reconnect and try to start. If it starts now replace the Power Supply. The Capacitors have started to go off and it's better to fit a new one before the rest of the computer gets trashed.

If it still doesn't work with a New PS there isn't much more you can do as it is either a M'Board or CPU Problem where something has been degraded and is now so far out of Specification that it is no longer working.

Incidentally just because Fans spin doesn't mean that the PS is working it just means that the PS is producing the 12 V DC it doesn't say anything about the 5 V DC or the 1.3 V DC let alone the current that is being produced by the PS.