I'm stuck after installing and rebooting.

I installed kubuntu in Windows, restarted the computer and it got stuck with a black screen an a mouse pointer on it. I restarted the computer and chose Kubuntu instead of Windows. Computer was automaticaly restarted. After normal things at the beginning of the booting proces, the computer got stuck at:

                    GNU GRUB version 2.00-7 ubuntu 4
Minimal BASH-like line editing i supported. From the first word, TAB lists possible command completitions. Anywhere else TAB lists possible device or file completitions.

Now I don't know what to do. Help please.