Strange booting problem

[jd1008]

On 06/24/2015 06:24 PM, Ralf Corsepius wrote:
> On 06/25/2015 02:07 AM, jd1008 wrote:
>>
>>
>> On 06/24/2015 05:57 PM, Rick Stevens wrote:
>>> On 06/24/2015 04:25 PM, jd1008 wrote:
>>>> Laptop: Dell Latitude E6510.
>>>>
>>>> OS: F20 with all updates
>>>>
>>>> Grub installed on sda.
>>>>
>>>> Power up ,and after bios's internal works, I do not get the grub menu.
>>>> All I get is an empty screen with the underscore cursor blinking at
>>>> upper left corner.
>>>>
>>>> Reboot.
>>>>
>>>> Press F12 to get the BIOS boot menu.
>>>>
>>>> Select Internal HDD
>>>>
>>>> Boots just fine.
>>>
>>> Looks like the BIOS' concept of the primary boot drive is different
>>> than "internal HDD". Check the boot order on the BIOS.
>> Boot order is
>> 1. CD drive
>> 2. USB drive
>> 3. Internal Drive
>> 4. Network
>
> Presuming this is a real BIOS system (not UEFI), my wild guess would be:
>
> You have a "malconfigured" grub installed in the MBR (/dev/sda) and a 
> "configured" grub installed in /dev/sda<boot-partition>.
>
> Should this reasoning apply, marking /dev/sda<boot-partition> 
> "bootable" (using gparted, fdisk etc.) should help.
>
> Ralf
>
It IS set to bootable (sda3)
But grub is on sda.

# fdisk -l /dev/sda

Disk /dev/sda: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: dos
Disk identifier: 0x0004ccd9

Device    Boot      Start        End    Blocks  Id System
/dev/sda1            2048   83888127  41943040   7 HPFS/NTFS/exFAT
/dev/sda2        83888128   84035583     73728   c W95 FAT32 (LBA)
/dev/sda3 *      84035584 1919970735 917967576  83 Linux
/dev/sda4      1919970736 1953525167  16777216  82 Linux swap / Solaris