Hey folks, I'm dealing with a frustrating problem after my Lenovo Yoga 7 Pro automatically updated Windows a few days ago. The very next day, I got a BSOD showing "KMODE_EXCEPTION_NOTHANDLED." Now, my laptop won't boot and gives me an error saying "Default Boot Device Missing or Boot Failed," along with no boot devices listed. It seems like my SSD is no longer recognized. I've tried several things: holding the power button for 60 seconds, using a bootable Windows 11 USB to repair the system, and even checking the SSD in an enclosure with another laptop—no luck. The SSD isn't detected there either. After some research, I found out that others are experiencing similar issues, but I also managed to get it recognized by the Windows installer. I also tried booting from an Ubuntu live USB, which detected the SSD but reported it as empty. I'm at a loss and am considering getting the SSD replaced or formatted, but I really hope it doesn't come to that. Any help or insights would be awesome!
3 Answers
Did you upgrade to Windows 11? I had a similar experience right after my upgrade. Check your BIOS settings to ensure CSM Support is enabled, and see if you need to set your storage boot option to 'Legacy.' Sometimes, if you’re booting via an MBR partition, you'll run into issues with secure boot.
It’s tough to see permanent SSD failures, but it’s possible that a hard reboot could help. Often, just power cycling the device fully brings it back to life. I’ve had a similar scare with my SSD a few years back, long before this update mess began. Just so you know, the update wasn’t widespread; it mainly affected certain SSDs and controllers, so it might not be related to your issue. What model SSD do you have? Are you on Windows 11?
Have you tried checking for dump files from the BSOD? They’re located in the C:WindowsMinidump folder if you can access it. Those files are crucial for understanding what went wrong. Zip them up and upload them to a file-sharing service; sites like catbox.moe or mediafire.com usually work well. The more dump files you have, the better!
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