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I am attempting to isntall a new biostar am2 socket micro board with a sempron cpu. I get everything connected, but when I turn on the power from the front panel, the fans will spin for a moment, then die and pressing the power button again will not do anything. If I turn off power from the back, then wait 30 secs, then turn it on then try the front switch it again spins the fans then dies. I have had this happen with two cpus (Athlon and now the sempron). I am not sure why this is happening but before I buy another item I'd like to see if I can get it to work.

Posted by bucc5062 on

  • bucc5062 Aug 08, 2008

    i took the cpu out, the panel switch turned the system on. I had to use the back switch to turn it off.

    I put the cpu back in, unplugged everything but power, and back to same action. I pulled memory and same on off result. I am not certain what you mean by two pins. There is a red jumper with two out of three covered. Anything else I can try? The biostar M800 motherboard should work with the sempron cpu chip.



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Steve Si

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Take out CPU and switch it on - do you get the same behaviour?
If so then CPU is probably wrong sort - check model of mainboard and CPU.
If behaviour is differnt then fit CPU and remove ram - if it beeps then CPU is working. Replace RAM and disconnect ALL other devices (hard disk, CD, front panel connect cable, reset button) just leave fans and power plugged in. now short out two pins for power on switch and see if it starts up.

Posted on Aug 08, 2008

  • Steve Si
    Steve Si Aug 08, 2008


    There should be a front panel header which connects to your power button, hard disk led, power led ,etc.

    disconnect all of these.

    Then you can switch on the mainboard by shorting out the two links where the power button used to connect to.

    This is quite safe as these pins are only low voltage - low current.

    If you have mistakenly connected the reset pins to the LED, then the board will be in permanent reset when you switch it on, by removing all cables, you can make sure you have not misconnected anything.

    If it did not beep when you removed ram then the CPU is not running :-(



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