Antec Power Supply Failure

I've built quite a few desktop pcs systems, from motherboards, etc. And, i've also repaired quite a few machines (e.g.compaq, hp, gateway, etc). It seems that power-supplies are the failure point much more often than i had expected. Once again, a couple of days ago, on a six-month old machine i own and built, (with good fans, no overclocking, etc), i inserted a 2nd ethernet-pci card into it, and when i brought it up for the first time, it wouldn't boot. (No smoke or noises. )The little activity light seemed to indicate random action, just as though it was seeking the disk and booting, but nothing ever showed up at the console, not even initial bios output. So, i took the case-side off, and hooked up my little power-supply tester-unit. Sure enough, one of the tester's multiple green lights did not light up, and that red 'danger' light on the tester did light up! [It's a fairly nice antec 400-watt supply, which is plenty of wattage for this system. It is an antec model sp-400 'smartpower'. ]

Any advice or comments about how often power-supplies fail, or thoughts about why this one might have?

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