Shuts down after 2 seconds

By Norm007
Jan 27, 2008
Topic Status:
Not open for further replies.
  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: 20,732   +156

    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 Newcomer, in training 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 Newcomer, in training Posts: 743

    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 TechSpot Evangelist Posts: 10,716   +6

    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 Newcomer, in training Posts: 3,556

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

    Norm007 Newcomer, in training 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 TechSpot Evangelist Posts: 10,716   +6

    Interesting. Please keep us posted.
  9. Tmagic650

    Tmagic650 TS Ambassador Posts: 20,732   +156

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

    tipstir TS Ambassador Posts: 4,596   +79

    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 Newcomer, in training 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 Newcomer, in training Topic Starter

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

    raybay TechSpot Evangelist Posts: 10,716   +6

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

    porsche911r Newcomer, in training Posts: 119

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