Check other drives and system logs first. If still unresolved, try formatting the boot drive or consulting a specialist.
Check other drives and system logs first. If still unresolved, try formatting the boot drive or consulting a specialist.
If it doesn’t allow access in the BIOS at all, it looks quite unusual. My Dell can enter the BIOS but needs F2 or ESC repeatedly right away once it begins. It seems likely you might have fast boot enabled, which prevents sufficient time for entry.
If that applies, I'm not sure what to do. I should check the mobo manual, there should be a way to save the UUID and secure the boot sequence. You might want to revert the BIOS back to default and then test the problematic drive by connecting it directly. Another option is to wipe the boot partition entirely and rebuild it. For Ubuntu or Mint users, gparted can help with this process via the interface. You could also use fdisk from the command line if needed.
I've faced similar issues before, but managing boot devices on ASUS Z97 boards is quite challenging. These kinds of problems make full recovery difficult. For instance, after swapping out the old SSD (Samsung 850 PRO 512GB) for a Samsung 860 EVO 500GB, the main screen lists all drives correctly, with P1 showing the new one. But when trying to access the boot menu and set Boot Priority, the new drive disappears entirely. You end up having to navigate to the Boot Menu to pick the device, where it appears last among outdated entries like the old drive. Tech support suggests removing the battery and letting the BIOS reset to factory settings, though this doesn't always fix the remaining issues. Over the years, ASUS boards have been my go-to, but unexpected glitches still pop up occasionally.