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Will a Mobo turn on without a CPU?

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  • Power Supplies
  • Systems
  • Components
Last response: in Systems
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April 3, 2014 10:58:50 PM

Hi guys!

I'm starting to build a new system but so far, my components are not yet completed. I only have a Mobo, an SSD, an HD and power supply. So far, I have already assembled all of these and I tried to turn on the system but nothing happens. Even my chasis fans won't spin. The power supply fan does not spin as well. Do I need to plug in a CPU in order for the motherboard to do something or one of my component is malfunctioning?

Also, my chasis came with a "buzzer" what's the use of that?

More about : mobo turn cpu

a b ) Power supply
April 3, 2014 11:01:36 PM

no the system wont post without a cpu and ram and video card and power.
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a b ) Power supply
April 3, 2014 11:02:42 PM

Yes the CPU needs to be installed, the minimum to power up (into bios) is motherboard (with onboard graphics, CPU and PSU and RAM. Hope that helps :) 
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April 3, 2014 11:04:26 PM

So I don't have to worry even though my PSU fan is not spinning?
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Best solution

April 3, 2014 11:15:09 PM

Some PSU fans won't spin until it is put under some kind of load like playing a 3D game. Regardless, your case fans should spin, and the LED on your motherboard should light up to show it is getting power even without a CPU.

The "buzzer" or speaker, connects with your case LED's, power and reset switch to tell you by beeping if your system has successfully POSTed. One beep means everything is ok, and anything else tells you you have a problem.
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April 3, 2014 11:20:26 PM

Now I'm confused. Should my chassis fans spin or not without a cpu and ram?
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April 3, 2014 11:30:01 PM

Case fans should spin, motherboard LED should light up and you should get beeping from the mothboard speaker that came with your case.
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a c 123 ) Power supply
April 3, 2014 11:32:33 PM

Its irrelevant/academic. Put your CPU, RAM and GPU in! Then talk to us.
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April 7, 2014 8:40:44 PM

It is relevant. What good is all that when your PSU is not working?
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a c 123 ) Power supply
April 7, 2014 11:54:09 PM

The you'll see if your PSU is working
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!