Hello!
Have big problems with these devices.
Thay are all new, from official dealers in our country.
B450M-HDV R4.0 Rev 4.03 with BIOS ver 7.40 and Ryzen 5 2400G.
The system just doesnt start - it has black screen, even cant enter BIOS settings.
First thought was that ver 7.40 doesnt support 2400G (https://www.asrock.com/mb/AMD/B450M-HDV%20R4.0/B450M-HDV%20R4.0%20Rev%204.02.asp#BIOS ) since its Raven, and Asrock doesnt recommend to use Raven with BIOS version higher than 3.10
So i tried to downgrade BIOS to 3.10
Installed other CPU, 5700X (not new, from other PC) - with this i sucessfully entered BIOS and tried to downgrade to 3.10. I prepared FAT32 flash drive, downloaded 3.10 ROM. BIOS have seen this device, but doesnt seen ROM 3.10 there. After this, i decided to downgrade to version between current 7.40 and 3.10, and then downgrade to 3.10, but computer just stopped powering on with 5700X, so i couldnt even enter BIOS. I changed CPU back, to 2400G and it sucessfully powered on, but still only black screen without opportunity to enter BIOS.
When there was 2400G, used motherboard's VGA or HDMI for video, when 5700X - installed graphic card RX 550 Aero ITX 4G OC.
And now i have just black screen 2400G and non-workable 5700X
So what should i do to make workable B450M-HDV R4.0 with Ryzen 5 2400G ?
UPD
Used OTHER NEW B450M-HDV R4.0 with OTHER NEW 2400G and OTHER (old) 5700X - it still has black screen with 2400G and even does not powering on with 5700X. So weird, cant fugire out what is going on.
