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Power loop before post, but if I reset the PSU it boots fine.

As in the title, my computer just recently if I boot it up from a full shutdown starts to power cycle itself repeatedly before hitting the post/BIOS Logo screen until I hard shut it off by holding down the power button, then unplug the PSU, flio the i/o switch then plug it back in. Then it boots fine, no problems at all and runs as good as new.

This is a recent issue; I've recently done a fairly sizable system upgrade, Z97 SABERTOOTH MK1 Motherboard, Intel i7 4790k and G.SKILL Trident X memory. It's run for about two weeks perfectly fine on this setup, so I'm hesitant to call it a new hardware conflict.

I'm thinking... PSU or something motherboard related?
4 answers Last reply Best Answer
More about power loop post reset psu boots fine
  1. It seems quite likely it is the PSU that's the problem here, what make and model, how old is it?
  2. C12Friedman said:
    It seems quite likely it is the PSU that's the problem here, what make and model, how old is it?


    It's an Antec Earthwatts, I can't get the exact serial number at the moment but it's the 650w model. It's about three or four years old though; which is why it's on my suspect list.
  3. If you know how I can test that, I've got a voltmeter, I just have no idea how to tell if a PSU is starting to go bad or if it's related to the MOBO somehow.
  4. Best answer
    If you jump the PSU, you can measure the voltages from the pins referring to this information http://www.playtool.com/pages/psuconnectors/connectors.html the voltages should measure within ±5% of the stated voltage on the positive rails and ±10% on the negative rails
    Note that that is the most rudimentary of tests and tells nothing about how the voltages are when the PSU is under a load (but it's what we got)
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