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MSI B450i with 3rd gen Ryzen CPU, not booting CPU debug light stays on



I have a MSI B450i (says ms-7a40 ver 2.0 on the PCB) and a Ryzen 7 3700X. I have both power connectors attached and RAM installed correctly, but the system doesn't boot. All it does is spin the fans and shine the CPU debug LED, which indicates a faulty or undetected CPU. I have tried shorting the BIOS reset pins already, that didn't help. Power LED stays dark as well. Does this indicate that I need an older CPU first to upgrade the BIOS, or could it be something else? The FAQ on MSIs site isn't really helpful.


EDIT: Apparently this does not support flashing from USB without a CPU, so that probably means I have to ask AMD for a loaner.



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Updated the BIOS or not? The board wasn't born with 3rd gen support, and even if it does say 3rd gen support on the box it might not be compatible with new steppings of CPU.

CPU: i7-2600K 4751MHz 1.44V (software) --> 1.47V at the back of the socket Motherboard: Asrock Z77 Extreme4 (BCLK: 103.3MHz) CPU Cooler: Noctua NH-D15 RAM: Adata XPG 2x8GB DDR3 (XMP: 2133MHz 10-11-11-30 CR2, custom: 2203MHz 10-11-10-26 CR1 tRFC:230 tREFI:14000) GPU: Asus GTX 1070 Dual (Super Jetstream vbios, +70(2025-2088MHz)/+400(8.8Gbps)) SSD: Samsung 840 Pro 256GB (main boot drive), Transcend SSD370 128GB PSU: Seasonic X-660 80+ Gold Case: Antec P110 Silent, 5 intakes 1 exhaust Monitor: AOC G2460PF 1080p 144Hz (150Hz max w/ DP, 121Hz max w/ HDMI) TN panel Keyboard: Logitech G610 Orion (Cherry MX Blue) with SteelSeries Apex M260 keycaps Mouse: BenQ Zowie FK1


Model: HP Omen 17 17-an110ca CPU: i7-8750H (0.125V core & cache, 50mV SA undervolt) GPU: GTX 1060 6GB Mobile (+80/+450, 1650MHz~1750MHz 0.78V~0.85V) RAM: 8+8GB DDR4-2400 18-17-17-39 2T Storage: 1TB HP EX920 PCIe x4 M.2 SSD + 1TB Seagate 7200RPM 2.5" HDD (ST1000LM049-2GH172), 128GB Toshiba PCIe x2 M.2 SSD (KBG30ZMV128G) gone cooking externally Monitor: 1080p 126Hz IPS G-sync


Desktop benching:

Cinebench R15 Single thread:168 Multi-thread: 833 

SuperPi (v1.5 from Techpowerup, PI value output) 16K: 0.100s 1M: 8.255s 32M: 7m 45.93s

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Updated the BIOS or not?

I couldn't, since I don't have an older Ryzen CPU, but I was hoping that it would come with up-to-date firmware from the vendor, who advertised it as compatible. The box only says "2000 ready".

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38 minutes ago, kshade said:

 but I was hoping that it would come with up-to-date firmware from the vendor,

It obviously didn't. Check if you board supports cpu-less flashing. If not contact AMD to get a free loaner CPU that will allow you to flash. 

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