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I'm trying to install 13.04 on an 80GB IDE HDD.

I've booted from the CD and set sda1 as the primary boot partition using ext4 filesystem and to format/mount as / I've set sda2 as a small (3GB) swap partition and set the file system as such.

Ubuntu installed okay (said to restart, ejected disc but didn't power itself off so had to power of manually - would that cause the problem?).

I have changed the BIOS back to boot from the HDD but now the BIOS doesn't recognise the HDD and I get 'operating system not found'?

I've already tried the setting 'large disc access' in BIOS (either DOS or other), neither work.

Any help would be very much appreciated!

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You can try boot-repair I get a simmeler problem a lot.

First boot into a live cd and open a terminal and type

sudo add-apt-repository ppa:yannubuntu/boot-repair && sudo apt-get update

Wait for it to finish then type

sudo apt-get install -y boot-repair && (boot-repair &)

You can now launch boot repair from the dash just follow the instructions on screen.

Here you can find some more info on boot-repair

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