I installed a new ASUS TUF B760 motherboard with the CPU, cooler, RAM, and SSD connected correctly. BIOS recognizes the CPU, memory, and SSD, but the computer keeps returning to BIOS instead of starting Windows. The boot menu says there is no bootable device. Windows is already installed on this SATA SSD and worked normally with my previous motherboard. Is there a BIOS setting I need to change, or is the existing Windows installation incompatible with the new board?
3 Answers
First confirm that the SSD appears under the SATA storage information, not just that the SATA port is detected. If it is visible but Boot Option Priorities are greyed out, the firmware has not found a UEFI-bootable Windows loader. That points to an MBR/Legacy installation rather than a missing SSD.
The HKC DS600 is a SATA drive, so it should be connected to a motherboard SATA port with both the data cable and power cable attached. It is not an NVMe M.2 drive, but that alone should not prevent it from booting as long as the board detects it and the Windows installation uses a supported boot mode.
The most likely issue is that Windows was installed in Legacy BIOS mode using an MBR partition table, while the new motherboard is trying to boot in UEFI mode. Check whether CSM or Legacy Boot can be enabled in the BIOS. That may let the existing installation start, although converting the drive from MBR to GPT is the better long-term solution so you can use UEFI normally. Back up important files before changing partitions, and reinstalling Windows is another clean option.
That’s probably the issue with an older installation. If you can boot it with CSM enabled, use Microsoft’s MBR-to-GPT conversion tool, then switch back to UEFI after confirming the conversion worked.