Many computer boot problems can be solved by reinstalling GRUB. Here is a short HOWTO to do this :
1) Boot on any Ubuntu live-CD (choose "Try Ubuntu")
2) Install and run Boot-Repair
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sudo add-apt-repository ppa:yannubuntu/boot-repair
sudo sed 's/trusty/saucy/g' -i /etc/apt/sources.list.d/yannubuntu-boot-repair-trusty.list
sudo apt-get update
sudo apt-get install -y boot-repair && (boot-repair &)
3) Click on "Recommended repair", or go into the Advanced options to customize GRUB options
More information on : https://help.ubuntu.com/community/Boot-Repair
Enjoy !
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