Motherboard emits a fast constant beeping tone. Biostar support suggested that while it was designed for 8th and 9th gen Intel CPUs, a bios update was needed to use a 9th gen CPU. So I tried an 8th gen CPU. Same problem. Memory is properly seated and confirmed not defective. Power is adequate (750 watt PSU). Tried CMOS reset too. No joy. Biostar tech support slow, unreliable and terrible English. Regretting the purchase.