Question only fan is working after upgrading motherboard and CPU on my HP pro book 645

Mar 12, 2019
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I had a HP pro book 645g1 then replaced it's motherboard and CPU with that of HP probook 650g1 (bcz they have same layout/design) after replacing the motherboard and insert a i7 4712mq CPU the laptop powered up and while in bios it made bip sounds and turned off..since then when i turn it on only the fan works but there is no display
 
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