where is my another CPU ?

Hello
I have a box with dual xeon 2.4 Ghz , and normally in whm it show as 4 Processor , but dont know why , today when i wake up , i found out my server is down , and after reboot it , WHM only show 1 Processor where is my another CPU ? !!! Anyboday know why ? ? ?

 

 

 

 

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