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This question already has an answer here:

First of all: I speak Spanish.
So I hope you understand what I am asking:

Recently I successfully installed Ubuntu 13.04.
So after a week, I turn on my computer and this is what I get.

This shouldn't appear, It has to appear just when I press F10.
So, when I select Ubuntu in Grub, appears a black screen like this:

enter image description here

So after this, I can't do anything... Ctrl+Alt+Del and F10 doesn't work... So I just turn off my computer the bad way.

What can I do?

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marked as duplicate by Eliah Kagan, belacqua, don.joey, Radu Rădeanu, Eric Carvalho Aug 2 '13 at 10:33

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

It could be an issue with your MBR, GRUB installation, or something of the sorts - try running Ubuntu using live media so you can download and run boot-repair. Simply put, you can type this in the terminal:

sudo add-apt-repository ppa:yannubuntu/boot-repair

sudo apt-get update

sudo apt-get install boot-repair

You can then launch the utility via the Dash or with the command boot-repair. Follow the recommended instructions and I believe it should at the very least do a full reinstall of GRUB2. You may be able to perform these same steps using the root prompt in the recovery tool (second boot option) but I'm not sure about that.

Otherwise, it could be an issue with the installation itself, for which you could try to run the diagnostic utilities provided by the recovery tool, or you may have to reinstall.

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