The manual explicitly states that for dual-channel mode, you must populate the DIMM slots in a specific order.
Warning from the manual: Do not mix 1.35V (low voltage) and 1.5V RAM. Use only DDR4 UDIMMs. If you use a 7th Gen CPU, RAM runs at 2400MHz; if you use a 6th Gen CPU, it downclocks to 2133MHz. ib250mh motherboard manual
Since you may not have the physical booklet, here are the most referenced sections of the IB250MH manual recreated from verified specs. The manual explicitly states that for dual-channel mode,
Forgot your BIOS password? The manual shows JBAT1 located near the bottom right edge of the board (near the battery). Warning from the manual: Do not mix 1
The fix: Open the manual to the "Storage Configuration" section. The IB250MH shares bandwidth. If you have a SATA-based M.2 drive, it will disable SATA port 3. Move your SATA HDD to port 1 or 2. If you have a PCIe NVMe drive, ensure BIOS version is at least F2.
The manual lists the following audio cues:
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