I have the BIOSTAR B450mx-s motherboard and I have the same problem: I have 2 sticks of 2400mhz RAM, with them my computer works normally. I recently bought 2 3200mhz memories and when I install them the computer turns on but there is no video, not even the bios screen!
I've already tried installing just 1 stick of 2400 and 1 of 3200, manually setting it to 2400mhz, but it still doesn't work, even when I install just 1 of 3200mhz.
Detail: when I install 2400mhz memories with XMP activated and set to 2400mhz, I receive the message: "Memory OC fail", but the computer works normally. Please help me!
I've already tried installing just 1 stick of 2400 and 1 of 3200, manually setting it to 2400mhz, but it still doesn't work, even when I install just 1 of 3200mhz.
Detail: when I install 2400mhz memories with XMP activated and set to 2400mhz, I receive the message: "Memory OC fail", but the computer works normally. Please help me!