Thank you, kind man!
Everything is back to its original state - with any video card, the PC issues a graphics core error (three red long flashes and three white short flashes). I will continue to search for information about the malfunction. Thanks!​...

HP Elitedesk 705 G4 SFF. Ryzen 7 pro 2700.
Product number: TZW28EA#ACB
Serial number: CZC944CPJJ

Hello! I also have a problem with the same PC. Please help me solve the problem too.
I bought a new Radeon RX6400 graphics card to replace the stock R7 430. I chose this card because it is low profile, low power (R7 430 - 50W, RX6400 - 55W). After installation, the PC could not turn on. The power LED lights up for a few seconds and turns off. And it repeats itself all the time. I installed a stock video card, the PC booted up as always. Installed the RX6400 - reboots again. Then I reset the Bios settings. After that, the PC began to signal an error with a power indicator - 3 long red flashes,...