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New build hangs on POST screen

ThreeG
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CPU checked, no bent pins. But, after some more troubleshooting we decided to flash the Bios (using the same version, as there are no newer ones) via Q-Flash Plue and it worked! So yeah, apparently Bios was corrupted for some reason

Hey, my friend just finished new build but we have some difficulties booting this thing up. It appears to hang on POST screen with no specific messages, but I'll put more details below.

 

Here's the specs:

AMD Ryzen 7 5800x3D
Gigabyte B550 Aorus Elite v2 Rev 1.2 (BIOS version HB)

Kingston Fury 2x32GB 3200Mhz CL16

MSI RTX 3090 Gaming X Trio
Samsung 980 1TB M.2
FSP/Fortron Hydro G Pro 850W

All components except RAM and GPU are new. RAM works on previous config just fine though.

 

After pressing Power button there is one short beep, then there's Aorus' logo for half a second (the one showing keys needed to enter BIOS etc.), then it shows POST screen but there is only AMI logo in top left corner (no text at all). Fans and LEDs work just fine. 

What we've tried so far:
- checked all cables and connectors - everything is connected properly
- cleared CMOS 
- tried one RAM stick in every slot
- tried to enter the BIOS, but pressing Del doesn't do anything
- removing RAM entirely - in this case Mobo doesn't beep at all and there is no video output.

- checked BIOS version - Rev 1.2 of this mobo comes with BIOS that supports Ryzen 5xxx CPUs and there are no newer versions.

We still have RAM and GPU from previous build so we'll eventually test it with those, but I have the feeling that it's just faulty motherboard itself.

Any ideas what else we should check?

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1 hour ago, ThreeG said:


Any ideas what else we should check?

... the CPU for bent pins?

  • Main PC: AMD Ryzen 9 5900X - EK AIO 360 D-RGB - Arctic Cooling MX-4 - Asus Prime X570-P - 4x8GB DDR4 3200 HyperX Fury CL16 - Sapphire Pulse Radeon  RX 5700XT - 1TB Kingston Fury Renegade - 1TB ADATA SX 6000pro  - 512GB ADATA SU800 - 1TB Seagate Momentus 5400rpm 2.5" - SAMA Armor Gold 750W  - custom black ATX and EPS cables - Fractal Design Define R5 Blackout - Windows 11 x64 2022 - 3 Arctic Cooling P14 PWM PST - 2 Arctic Cooling P12 PWM PST
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  • Laptop: Acer E5–575G-386R 15.6" 1080p (i3 6100U + 2x4GB DDR4 + GeForce 940MX + 256GB nVME) Win 10 Pro x64 22H1 - Logitech G305 + AAA Lithium battery
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CPU checked, no bent pins. But, after some more troubleshooting we decided to flash the Bios (using the same version, as there are no newer ones) via Q-Flash Plue and it worked! So yeah, apparently Bios was corrupted for some reason

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