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BIOS Can Not Find Disk

Maybe this is the wrong forum, but please bear with me a little bit. This post was sent from a desktop with jessie installed. The problem is it will not boot normally. Network booting has been disabled in the NVRAM setup. After POST there is a one-liner which says it can not find disk. It can be booted with a supergrub2 cd, however.

# fdisk -l

Disk /dev/sda: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: A615A904-0620-459F-BF44-5E53E54FDF24

Device         Start        End    Sectors   Size Type
/dev/sda1       2048     411647     409600   200M BIOS boot
/dev/sda2     411648   16783359   16371712   7.8G Linux swap
/dev/sda3   16783360  151001087  134217728    64G Linux LVM
/dev/sda4  151001088  285218815  134217728    64G Linux LVM
/dev/sda5  285218816  419436543  134217728    64G Linux LVM
/dev/sda6  419436544  553654271  134217728    64G Linux LVM
/dev/sda7  553654272 1953525134 1399870863 667.5G Linux filesystem

This post is being written with Debian 8 installed on /dev/sda3, above.

Apparently, BIOS does not see a bootable device. In the dim past, fdisk could set a partition as "active", which was its euphemism for "bootable". However now:

# fdisk /dev/sda

Welcome to fdisk (util-linux 2.25.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.

Command (m for help): a
a: unknown command

Additional info:

# uname -v
#1 SMP Debian 3.16.43-2+deb8u5 (2017-09-19)

HP Pro 3400 Series MT

BIOS version 7.16 dated 03/23/2012 with no update found.

How can /dev/sda1 be defined so that the bios will see it as bootable?


 - Dan