Computer completely dead. PSU?

Discussion in 'Power Supplies' started by micrometers, Jan 15, 2013.

  1. micrometers

    micrometers Diamond Member

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    Last night the computer worked fine.

    It has always worked fine.

    I shut it down last night.

    This morning it won't turn on.

    Nothing has changed. I looked inside and there is no LED light on.

    Did the PSU die suddenly?

    Specs:

    i5 ivy bridge 3450

    Nvidia GTX 560 ti 448

    8gb ddr3 ram.

    2tb 7200 RPm HD

    120GB SSD

    400 watt PCPower MKIII PSU.

    Yes, 400 watt seems low, but it had never given any problems in the past like 6 months. Also, it was recommended here as superior to many 500 watt models, and all of the PSU calculators I saw say my average power draw should be 320 watts and max 384 -- within range.

    Any other advice? What could have happened? there's no smell, nothing.
     
  2. Eureka

    Eureka Diamond Member

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    400W is plenty.

    If there is no LED, then your PSU probably died. Unplug/replug the power cord. Check to make sure the power switch on the back of the PSU is on. If it doesn't even begin to turn on, it's probably the PSU.
     
  3. micrometers

    micrometers Diamond Member

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    I"m trying to do a back of the envelope calculation.

    Max TDP of a GTX 560 ti 448 is 210 watts.

    Ivy i5 non-overclocked is 77

    Add in 80 watts for miscellaneous everything else: hard drives, fan, MB, mouse/kb

    and that should be like 350. Max. Should be healthily within range.
     
  4. TemjinGold

    TemjinGold Platinum Member

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    Your PSU size is fine but the PSU itself may have just died. Not due to needing too much power but due to hardware malfunction.
     
  5. VirtualLarry

    VirtualLarry Lifer

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    That's what happened with my old HTPC. It ran 24/7, and once when the power went out, I had difficulty getting it to power on again. I replaced it around a month later with a new HTPC, and when put the old one on the test bench, I couldn't get it to power up no matter what I did. I decided that the PSU must have died. (I connected the mobo to a known-good PSU and it powered right up.) I have since re-built the old HTPC inside a new case+PSU, and it runs fine again.
     
  6. HardcoreRobot

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    dont forget to test the outlet and power strip if you are using one

    make sure all the connections outside and inside are tight

    next swap PSU and try, could be mobo too if the LED you are talking about is ont eh board
     
  7. Fallengod

    Fallengod Diamond Member

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    Sounds like PSU to me... If its not the PSU, its the mobo.

    Shouldnt be too hard to figure out. This is a reason many keep a cheap backup PSU on hand.
     
  8. max347

    max347 Platinum Member

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    +1 to testing the power strip
     
  9. micrometers

    micrometers Diamond Member

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    Okay, it works now.

    What I did was unplug everything for a few hours.

    Came back, plugged it in, and it works again.

    Any ideas? I'm guessing something about the MB and a capacitor battery.
     
  10. corvaxmuzzy

    corvaxmuzzy Junior Member

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    If no LED was on (that is normally on):
    Power outage.
    Bad house wiring.
    Bad connections.
    Component-level malfunction.

    You do not have a capacitor battery in your computer.
     
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