TechSpot

PSU fan stays on after PC has shut down (?!?!?)

By Hendo
Oct 20, 2007
  1. I'm having a strange problem with my PSU. After doing a regular shutdown like any other computer, the fan on my PSU stays on. It doesn't switch off after about 10 seconds after I turn off the computer at the mains (after it's shut down). I hear a little sound like some static discharging or something (it's hard to describe). Anyway my computer will not turn back on until I have turned it off at the mains for about 10 seconds. It hasn't always done this, and I can't think of anything that would have caused this. It is a Hiper HPU-3S350. Also I built my PC (that probably explains a lot!) Any help is appreciated.

    Thanks

    James
     
  2. Rik

    Rik Banned Posts: 4,985

    Sounds like a new psu is a must there.
     
  3. Hendo

    Hendo TS Rookie Topic Starter Posts: 17

    Yeh I thought that might be the case (unfortunately)

    Thanks anyway
     
  4. Rik

    Rik Banned Posts: 4,985

    One thing you could do as a test. Disconnect the psu from everything but the mains and short the green wire to any black one. The psu should spin the fan up while shorted than shut it off when not.
     
  5. Hendo

    Hendo TS Rookie Topic Starter Posts: 17

    Ok, I'll give that a try.
    Thanks
     
  6. Rik

    Rik Banned Posts: 4,985

    Let me know how you get on, im the closest there is to a psu expert. I've repaired a few good quality ones in the past. My pc is currently running on one that I repaired, only cost 38p to fix.:)
     
  7. Hendo

    Hendo TS Rookie Topic Starter Posts: 17

    Could you give (or re-direct) me to a quick guide to test the PSU? Just so I don't mess anything up. If that doesn't work, I would definetly be willing to pay you to take a look at it if possible
     
  8. Tedster

    Tedster Techspot old timer..... Posts: 10,074   +13

    sounds like you got a short. It would be far better to replace this PSU before it takes out your system or worse, starts a fire.
     
  9. Hendo

    Hendo TS Rookie Topic Starter Posts: 17

    Good point actually. I'm thinking about selling up, so I have to make sure everything is working perfectly, even if that means replace parts
     
  10. zipperman

    zipperman TS Rookie Posts: 1,423   +7

    Check your settings

    Control Panel/Power options.
     
  11. Hendo

    Hendo TS Rookie Topic Starter Posts: 17

    what should I be looking for?
     
     
  12. Rik

    Rik Banned Posts: 4,985

    Conrtol panel will not help, you definately have a hardware problem, not a software one.
     
  13. Hendo

    Hendo TS Rookie Topic Starter Posts: 17

    Thought as much, I'll give that test a go
     
  14. zipperman

    zipperman TS Rookie Posts: 1,423   +7

    Since you asked

    Try here and advanced tab.
    You got nothing to lose.Also use Windows Help and support.
    Search for Power.
     
  15. Rik

    Rik Banned Posts: 4,985

    The pc has problems at start-up and on shutdown. Read the first post. It's absolutely nothing to do with windows whatsoever.
    The symptoms appear before windows has begun to boot then reappear once it has shut down completely.
    Logic dictates that it absolutely cannot be a software issue of any kind, its just not possible.
     
  16. akb

    akb

    Could you please check power condenser on your mainboard ? They are near the power input connector of mainboard.if Some condesers head has swelled, you need a new mainboard or repair condensers
     
  17. Rik

    Rik Banned Posts: 4,985

    Do you by any chance mean capactors?? I have spent 15+ years in the electronics trade and have never ever heard of a
    .
     
  18. SNGX1275

    SNGX1275 TS Forces Special Posts: 12,685   +333

    I checked their website and didn't see any information on this, but - is it possible that the fan is supposed to stay on after shutting down? I've got 2 Enermax PSU's that run the fan until the PSU temperature drops below a certain threshold. I guess this wouldn't explain why you can't get it to come back on without unplugging, but at least it is thrown out there for others to see that some PSU's are supposed to continue to run the fan.
     
  19. Tedster

    Tedster Techspot old timer..... Posts: 10,074   +13

    he has a power supply issue. A few years back there were a flood of bad capacitors on the market, but that has been resolved to my understanding. 90% chance his PSU is gone tits up.
     
Topic Status:
Not open for further replies.


Add New Comment

TechSpot Members
Login or sign up for free,
it takes about 30 seconds.
You may also...


Get complete access to the TechSpot community. Join thousands of technology enthusiasts that contribute and share knowledge in our forum. Get a private inbox, upload your own photo gallery and more.