I had to boot my HP Envy into Win8 for the first time in ages this morning.
When I did that, it installed some updates including a BIOS update.
Once this was all done, once again the GRUB boot menu was gone and it booted straight into Win8. Using the advanced boot manager options in Win8 I
managed to get the EFI boot menu up and chose Ferdora 21.
It was only after Fedora failed to boot that I realised that this was wrong.
Some time ago I had replaced F21 with CentOS 7 and the three CentOS 7 options were the ones that should be available – plus the Windows 8 boot manager.
I have managed to boot into a CentOS 7 Live KDE image. In this ran efibootmgr which shows the same thing. I can fix the boot sequence, but that will not get me back the CentOS entries.
Can anyone suggest how I can do that?
[root@localhost ~]# efibootmgr BootCurrent: 0000
Timeout: 0 seconds BootOrder: 2002,0002,3002,0001,2001,2003
Boot0000* Internal CD/DVD ROM Drive (UEFI)
Boot0001* Fedora Boot0002* Windows Boot Manager Boot2001* USB Drive (UEFI)
Boot2002* Internal CD/DVD ROM Drive (UEFI)
Boot3000* Internal Hard Disk or Solid State Disk Boot3002* Internal Hard Disk or Solid State Disk