Boot failures are most commonly caused by firmware settings, incorrect OpenCore configuration, or USB mapping problems. Here is a structured approach.
Step 1 — Boot with Verbose Mode
Add -v keepsyms=1 debug=0x100 to your boot arguments.
Step 2 — Check Firmware Settings
Disable Secure Boot, Fast Boot, and CFG Lock. Set SATA to AHCI. Enable UEFI boot mode.
Step 3 — Validate OpenCore Configuration
Run ocvalidate on your config.plist. Use ProperTree to perform a clean snapshot.
Step 4 — Test with a Fresh USB Installer
Recreate the installer on a different USB drive and try a USB 2.0 port.
Expected Results
- Verbose boot passes the previous stopping point
- The installer sees the target disk
- Keyboard and mouse respond during the installer
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Original Question: "Need help. Reboot and Select proper boot device or insert boot media in selected boot device"
Ugh so I took out my video card power cord to help my son with his computer. Put cord back and I am getting reboot and select proper boot device or insert boot media in selected boot device and press a key.
Running opencore - Catalina
Thanks in advance for any help.
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