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Shuts down after 2 seconds

By Norm007
Jan 27, 2008
  1. I Have fitted a new motherboard (MSI K9AGM2) toegether with an AMD Sempron cpu and 1 gig ram purchased as a package. The unit booted up but while I was in setup keying in date and time everything shutdown (unit ran for 5 mnutes). Now when I try to start it goes for 1 to 2 seconds then everything shuts down including fan on power supply. If i unplug the Jpw1 (power for cpu) it keeps running ok and doesn't switch off without the cpu. Heat sink checked and reset - doesn't seem to be hot and couldn't in 1 second. Have unpluged power to hard drive and cd but that doesn't change it. Must be something switching everything off at startup. Any idea's??
     
  2. Tmagic650

    Tmagic650 TS Ambassador Posts: 17,227   +232

    Make sure you have connected that 4, 6 or 8 pin power connector from the power supply to the motherboard near the CPU
     
  3. Norm007

    Norm007 TS Rookie Topic Starter

    Yep its a 4 pin power plug that runs the cpu. When it's pluged in everything shuts down after 2 secs and when it's not the fans, hard drive and power supply keep running.
     
  4. k.jacko

    k.jacko TS Rookie Posts: 493

    Faulty V-rails on the psu?
    Do you have another psu you can try, its always the cheapest solution. A 300w should be fine for your rig. If it still shuts down, i'd RMA the motherboard.
     
  5. raybay

    raybay TS Evangelist Posts: 7,241   +9

    Double check every connection by removing and reseating all memory, cables, etc. Something fundamental and basic is out of whack. If it is truly only running for 2 seconds, I would suspect the power supply, memory, or video graphics.
    What happens when you cold boot in SAFE MODE?
     
  6. CCT

    CCT TS Evangelist Posts: 2,653   +6

    Good possibility your heatsink isn't making good contact with the cpu.
     
  7. Norm007

    Norm007 TS Rookie Topic Starter

    I put the multi meter on the cpu power plug connections and I get 26 volts. Manual says it should be 12 volts. PSU might be the problem.
     
  8. raybay

    raybay TS Evangelist Posts: 7,241   +9

    Interesting. Please keep us posted.
     
  9. Tmagic650

    Tmagic650 TS Ambassador Posts: 17,227   +232

    If you have applied 26 volts to a 12 volt circuit, the motherboard/CPU may be fried
     
  10. tipstir

    tipstir TS Ambassador Posts: 2,383   +105

    Was this and older case with PSU? What's the rating on the PSU in terms of Watts and Volts.. I know you said a volt meter was use to tell you 26volts..
     
  11. Norm007

    Norm007 TS Rookie Topic Starter

    The PSU is a 430 watt Thermaltake. The PSU and case are a year old and used to build up a unit which never ran. So I repaced the motherboad and cpu. I used a multi meter to check the voltage on the four pin power plug for the cpu.
     
  12. Norm007

    Norm007 TS Rookie Topic Starter

    I have replaced the power suppy plus the mother board and the cpu again and it's running fine
     
  13. raybay

    raybay TS Evangelist Posts: 7,241   +9

    Thank you for the update. It is always great to learn what really happened.
     
  14. porsche911r

    porsche911r TS Rookie Posts: 37

    yahh lol exactly ray i wish every1 did this instead of leaving us in the air :(
     
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