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My Thermaltake Toughpower Grand 750W PSU (P/N TPG-750M like on their web page, but the design shown below) has a mechanical AC push button rather than an on/off switch, and after turning it off today to change some hardware it won't stay on after pushing again (So yes, I've tried turning it off and on again, and I've made sure it's plugged in). In fact, I had to jam it on with a piece of plastic against some furniture to make it stay on, which is not a tenable situation.
It might still be under warranty, but I'd like to know first if this could be the result of some sort of safeguard and if there are any quick fixes for it. Holding it in place may be an option, but it would have to be done without blocking the air flow.
Jamming the button with the thin end of a strip seal works for now...
1Sounds like a physical defect to me. – Havenard – 2013-04-11T18:14:07.930