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I just installed Fedora 18 alongside a pre-existing windows 7 from a live-usb to a single 1TB hard disk with multiple partitions.

created all necessary partitions as recommended:

/     :40GB
/boot :200MB
/home :350GB

plus

BIOS BOOT of 1MB

The setup ended with a successful installation message but when I rebooted the GRUB didn't load. In fact the BIOS didn't show HDD in the boot order.

When I again booted using live-usb I saw that all the partitions were existing.

I tried reinstalling; the setup detected previous installation. I reinstalled with same partition sizes but again the boot failed.

I had read, recently, about installing Ubuntu in EFI mode, which specifies that:

  1. There needs to be a EFI boot partition (Optional: with mount label /boot_efi).
  2. It needs to be in the starting of the disk and should be FAT32

A windows EFI boot partition already exists. I thought I shouldnt mess up with this and created a separate BIOS BOOT partition for linux. I was not sure how to assign this as a EFI type partition. When I continued with the installation I saw that grub was installed and updated too. But again linux failed to boot.

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Is BIOS set to UEFI or legacy mode? –  mvp Feb 5 '13 at 11:11
    
I shall verify.. most probably the UEFI mode.. Does the bios option have a mode setting? Also please let me know what difference does the mode make.. –  bharat_iyengar Feb 5 '13 at 11:38
    
If I were you, I would disable UEFI if possible. Both Win7 and Fedora should work fine in legacy mode. –  mvp Feb 5 '13 at 11:46
    
there is no particular option called disable UEFI in my BIOS. Does it have any alias ? –  bharat_iyengar Feb 5 '13 at 12:17
    
How many disks do you have and what partitions are on them? grub was installed to the first disk's mbr? /boot has the BOOT flag set? –  ott-- Feb 5 '13 at 13:45
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