AMD Ryzen 7 5700x3D upgrade - Not Booting

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   I have a Fatal1ty B450 Gaming-ITX/ac motherboard with 16GB of memory and an AMD Ryzen 5 3400G cpu. (the system was working fine for almost 5 years)

One week ago, I bought a Ryzen 7 5700x3D processor.
After installing it, the pc would not boot. Black screen without posting. I press F2, but not able to get into the BIOS, the only way I can do is to long press the switch and shutdown the computer.
Before I install the new Ryzen 7 5700x3D processor onto the Fatal1ty B450 Gaming-ITX/ac motherboard, I did flash the BIOS to version 10.31 (Beta). After the first try with black screen, I did flash the BIOS to version 8.01 (Beta), but it is no luck to boot up with the combination of Asrock Fatal1ty B450 Gaming-ITX/ac and AMD Ryzen 7 5700x3D processor. 

I type this report to you by using my old CPU (AMD Ryzen 5 3400G). So I am sure the motherboard is OK with the old combination, it just can't work with Ryzen 7 5700x3D processor.

I have reset the CMOS as well, and no luck.

Can anyone help?

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adktk Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 3 hours 2 minutes ago Status: Offline Points: 20	Post Options Post Reply Quote adktk Report Post Thanks(0) Quote Reply Topic: AMD Ryzen 7 5700x3D upgrade - Not Booting Posted: 2 hours 33 minutes ago at 10:27pm
	I have a Fatal1ty B450 Gaming-ITX/ac motherboard with 16GB of memory and an AMD Ryzen 5 3400G cpu. (the system was working fine for almost 5 years) One week ago, I bought a Ryzen 7 5700x3D processor. After installing it, the pc would not boot. Black screen without posting. I press F2, but not able to get into the BIOS, the only way I can do is to long press the switch and shutdown the computer. Before I install the new Ryzen 7 5700x3D processor onto the Fatal1ty B450 Gaming-ITX/ac motherboard, I did flash the BIOS to version 10.31 (Beta). After the first try with black screen, I did flash the BIOS to version 8.01 (Beta), but it is no luck to boot up with the combination of Asrock Fatal1ty B450 Gaming-ITX/ac and AMD Ryzen 7 5700x3D processor. I type this report to you by using my old CPU (AMD Ryzen 5 3400G). So I am sure the motherboard is OK with the old combination, it just can't work with Ryzen 7 5700x3D processor. I have reset the CMOS as well, and no luck. Can anyone help?