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Rebuilding PC I have transferred all parts of my PC from the manufacturer's slimline case to a standard case with a new quieter CPU fan.  It powers up for a few seconds and then shuts down.  Why might this be?  Can you help?

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  • charlie1000 Jan 09, 2008

    The PC is (was!) a Phillips Freevents, Intel P4, motherboard is gigaybyte 649-M3. (Have looked for motherboard schematic but no joy).

  • charlie1000 Jan 09, 2008

    Those two cables are connected as shown. The model number is LS-1500-UK

  • charlie1000 Jan 09, 2008

    any thoughts?

  • charlie1000 Jan 09, 2008

    I think so, there seems to be only one place it can go (that is the wire labeled "Power SW", right?). There is no label on the motherbaord but there appears to be only one connection on there which fits it.

    I have just done a bench test both with the old system (with old case etc) and the new system (with new case, new CPU fan and power supply). The old system came on for less than half a second, the new system for about 3-4 seconds.

    Any more ideas? Any help is appreciated

  • charlie1000 Jan 09, 2008

    Ok, i tried what you said with the old case, old power supply and new CPU fan.

    With just motherbaord and RAM, the CPU fan started and continued fine.

    When I connected the power to the CPU (the square connector with four pins, near to the CPU) it powered up for about 3-4 seconds then beeped and shut down.

    What does this mean? Is the new CPU fan not strong enough for the processor?

  • charlie1000 Jan 09, 2008

    Will do, I reckon that's the most likely problem myself aswell, thanks for your help



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Are you sure you connected all the power cables from the power supply that need to be connected to the motherboard? Please tell me what motherboard and processor you're using so I can further assist you.

Posted on Jan 09, 2008

  • 2 more comments 
  • Yonatan Horan Jan 09, 2008

    Your motherboard may require you to connect a cable that looks like this, in addition to the cable that looks like this. What's the PC's model number and who is it manufactured by?

  • Yonatan Horan Jan 09, 2008

    Are you sure you connected the cables from your case (ie. the ones that connect your power button to your motherboard) properly? If you didn't it could cause this.

  • Yonatan Horan Jan 09, 2008

    You moved the motherboard, etc. back to the old case and it wouldn't load? The problem is probably that you didn't connect something properly. In order to diagnose it you can try starting from scratch, that is, just have your motherboard connect to your power supply (without the processor, RAM or anything else) and to the case. Try turning it on. Then, if it turns on, try adding components one by one, until you find the one that's causing the trouble.

  • Yonatan Horan Jan 09, 2008

    The problem is most likely that you installed the CPU fan incorrectly. Try changing it around and looking at the directions that came with it. It may need to be tighter on the processor, or looser - I can't tell as I can't really take a look at it. :) Try removing the fan and putting it back on, making sure the thermal paste is aligned with where it's supposed to be on the CPU and mess around a bit. Eventually you'll get it right.



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