07-19-2013
Your systems BIOS has probably some boot priority set: prospective devices with bootable media (hard disk, CD-ROM, Floppy, USB stick, ...) are scanned and tried for bootable media. It is also possible to exclude devices from this process: once you have installed your system you probably do not want an accidentally left CD-ROM to be tried for a bootable system and hence stop the boot process, therefore it is commonly disabled as a booting device. Now is the time to revert this setting (and maybe switch it back on once you solved the problem).
There is probably also a key "boot options" which you can press during BIOS boot which allows you to temporarily pick a booting device.
I hope this helps.
bakunin
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LEARN ABOUT CENTOS
isohybrid
isohybrid(1) General Commands Manual isohybrid(1)
NAME
isohybrid -- Post-process an ISO 9660 image generated with mkisofs or genisoimage to allow hybrid booting as a CD-ROM or as a hard disk.
SYNOPSIS
isohybrid [OPTIONS] <boot.iso>
DESCRIPTION
The isohybrid utility modifies a an ISO 9660 image generated with mkisofs, genisoimage, or compatible utilities, to be bootable as a CD-ROM
or as a hard disk.
OPTIONS
-h <X>
Number of default geometry heads
-s <X>
Number of default geometry sectors
-e <X>, --entry <X>
Specify parititon entry number (1-4)
-o <X>, --offset <X>
Specify partition offset (default 0)
-t <X>, --type <X>
Specify MBR ID (default random)
-u, --uefi
Build EFI bootable image
-m, --mac
Add Apple File Protocol partition table support
--forcehd0
Assume we are laoded as disk ID 0
--ctrlhd0
Assume disk ID 0 if the Ctrl key is pressed
--partok
Allow booting from within a partition
-?, --help
Display help
-v, --verbose
Display verbose output
-V, --version
Display version information
SEE ALSO
mkisofs(1)
isohybrid 17 Jan 2014 isohybrid(1)