No bootable devices found after update

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I installed RHEL 7.2 Desktop x86_64 on a Dell XPS. Installation appeared successful and I was able to reboot successfully. However, after yum update I am unable to reboot; I get "ERROR Verification failed (15) Access Denied" and subsequently "No bootable devices found". Dell diagnostic tests were all passed. Booting from the USB I am able to see the old installation directory.

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Disabling Secure Boot in BIOS setup appears to have fixed the problem. Any thoughts about leaving it disabled? Jeff

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