Weird PSU problems - constant reboots with HDD connected

By ravenstarr
Aug 28, 2013
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  1. I was working on my computer when suddenly it restarts and goes into a continuous loop of turning on for 5 seconds, then off and back on again. If I disconnect my SATA hard drive (WD Caviar Blue 500GB 7200RPM) it doesn't do this. If I connect an EIDE hard drive (WD2500 Caviar 7200RPM) it boots fine. PSU is 450W, rather old (6+ years) and heavily used.

    I replaced the PSU with a 400W, similar age but much less used, and then computer boots fine with SATA drive.

    I think it's safe to say the PSU is broken, but what I would like to know is why can it boot with a similar drive on a different interface? According to the label the EIDE drive even draws more current. Also, is it completely broken or is this something that can be analyzed further?

    I did some measurements on the computer while it was running:
    SATA power connector (broken PSU): 2.7V / 4.3V / 11V
    SATA power (conv. from MOLEX) (working PSU): 4.3V / 10.8V (there is no 3.3V connector)
  2. Tmagic650

    Tmagic650 TS Ambassador Posts: 17,244   +234

    Try another power supply, preferably 550 watts or better

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