No display on Acer Predator PO5-640 ER11

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I have acer po5-640 Er11 system with intel i7-12700 CPU 32GB RAM and 1TB SSD.

Upon boot, black Screen. Not even acer logo. I tried different RAM, GPU card and SSD but no luck. Fans, GPU card, SSD everything is OK.

I installed another brand new intel i7-12700F CPU and now I am getting continuously 1 long 2 short beep sound. Non stop. And then again I put old 12700 CPU back and check then I found CPU is getting super hot in seconds. You can't even touch the CPU.

But no display at all. Should MoBo is having an issue or CPU?

What else should I check? Please help.

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