[Help] I couldn't start it

I just built my new desktop. But after I pressed the power button, the cpu fan and case fan ran for a few seconds and stopped. no alarm, no display on monitor.
who can tell me , what should I do?
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More about help couldn start
  1. Best answer
    That usually means that you did not connect the main power to the motheboard, and/or the CPU processor fan is also not connected.
  2. but the cpu fan span for a few seconds.
  3. True, check the main power connector for the motherboard.
  4. I connected the ATX 24-pin power supply, I checked the connector , it is done firmly. and the beep speaker didn't make a noise.
  5. yes, I only connected the 24-pin and didn't connect the 8-pin cpu power supply.
    issue solved. thanks
  6. Best answer selected by limyth.
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