Asus b250 mining expert. No video from HDMI

At the start, I see the logo of the Asus, immediately after that, the monitor displays a message about an unsupported resolution of 1376x800@60Hz and that’s it, it does not allow you to enter the BIOS. The speaker beeps briefly 1 time, i.e. everything is normal. Without memory - long and 2 short. There is no signal from the card in the x16 slot. Occasionally it gave out a bluish picture, I managed to go into the bios and configure it. Mining started somehow. Now, after the last reset - no way. What’s it? South Bridge under replacement? Thanks.