On Thu, Mar 5, 2015 at 1:58 PM, German <gentgerman@gmail.com> wrote:

I have a SSD in my laptop and the system boots really fast so I can't see the details of the warnings it displays. Are there any way to scroll the screen or see some system boot's logs?

Try;

dmesg | less

And you may also find what you need in /var/log/messages.