Computer boot up slowly

[HANAE]

The computer boot up slowly and the screen before the choice of sessions at this time we are seeing very briefly on a screen and the pc restarts and so on.
I am completely unable to fix it.

Can you help me ?

Thanks

[Markos]

The OS should have a fairly significant problem. The screen is what color blue I guess? If so, should think it is a problem on the OS (like viruses very powerful PC off when he touched a very important file). You'll have it understood is a bit vague, but I track on your OS.

[Blakeexz]

I had the same case, my computer returns from service for a change of the HDD. To be sure go to step 2 and then when you're done come back here and you start trying without failure, if it does not sound install. to retrieve the data you do not have a solution 36 => linux live cd and you copy the document on external HDD