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For 1.5 weeks this space heater solution has done the trick. Whatever components that are near the rear are heated up the most, and I think are most likely relevant. I don't think the heat even needs to dissipate through the whole PSU really. I do need to aim the heat directly at the PSU, down lower at the mobo will take much longer. I don't need to cook the thing, just heat it up to 70-75F or so. If I point a space heater at the rear end of the PSU for 3-5 minutes (such that the rear end is warm to the touch ), the PSU will boot without problems on the first try.(My theory is that this heats up the PSU enough that no protection mechanism causes the PSU to shut off- due to a failing capacitor perhaps?) When cold, eventually after pressing the power button multiple times in sequence at 1Hz, the computer will boot.Doesn't seem too healthy so I avoid that. If I hold the button down it will cycle on and off repetitively where the step function 'wavelength' is about 0.8 seconds. The mobo (Sabertooth 990fx) lights a series of leds in sequence to indicate where it is in the boot sequence. 5 seconds the CPU led is lit, sometimes before that particular led lights up). Just shuts off shortly into the boot sequence (usually during the. When cold, my power supply seems to shut off a split second after I press the desktop power button.Cold booting works w/i 20 minutes or so of shutting it down (I suspect due to lingering heat).Most recently it takes 20+ times without heat added (room temp is chilly, around 58F I guess). As time increased (and the room temperature decreased due to winter), I've occasionally needed to press the startup button more times in sequence. A couple months ago I've needed to press the startup button once or twice instead of just once.Couple HDDs, AMD CPU 125W, graphics card recommends 400W PSU w/ 12V current rating of 26A, but this PSU's relevant rating is 22A for each rail w/ 32A combined: Gaming works great, so I don't think there is an issue here. First I will state my question: What do you think is causing the power supply to automatically shut down when cold? (somewhere <65F) After I heat it up for a few minutes using a space heater, it works on the first try! It would be nice to not have to heat it up using a space heater before starting it up.
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