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Hello Guys, so earlier today i tried to install my new Ryzen 5700x3d on my ASRock b450m pro4. Did a BIOS update because without it, it wouldn't post. I used the version 10.08 although it was a Beta, but it was the only version that came out after the 5700x3d came out. So i figured i had no other choice. Booted fine, played some games and it all went pretty well. I realized that reBAR was disabled, so i went into the BIOS to enable it. After that change, it didn't post at all anymore. I tried another GPU, my old CPU, checked the RAM and the PSU with an older one, nothing helped. every time after starting it i let it run like 15-20 minutes to ensure that it wasn't just processing something. Cleared the CMOS, didn't do anything. The real kicker is, everytime i turned it on, it had other charecteristics to it. Sometimes all the fans ran at full power (which to me would indicate that smth isn't plugged in properly), sometimes it seemed to boot normally fan-wise but still didn't post, sometimes only the CPU fan spinned. And sometimes it went into a boot-loop every 20-30 seconds. All wildly randomly, unpredictably. Mind you, between those times, i didn't change anything physically about the machine. So it literally had no chance to make a better connection somewhere or whatever. Only explaination i have is that the BIOS is fugged. I ordered a new mb and wait for it to arrive some day. Meanwhile i would like to tinker with it as much as i can and maybe hope that someone of you encountered something similar and can help me.
refresh the bios chip using the SPI header positioned above the first PCIe X1 slot. A ch341a and some Dupont female-female jumpers are required. The pinout details are available there. Likely the problem is with the BIOS, and a reflash should resolve it.