Q: Macbook Air 2010 - is not rebooting = [ help

First generation of the macbook Air , good condition...

i try everything... and when i press command + R ( I dont remember ) it should a lot of codes...

If you wish to boot the system:

     exit

:/root# exit ( i type exit )

logout

disk0s2: I/0 error.

disk0s2: I/0 error.

ext loading now disabled.

ext unloading now disabled.

ext autolaoading now disabled.

externel requestes now disabled.

( is not clear in the pic i took, i only see a n't)__get kextd port.

( same problem only see ncing) ___ disks... Killing all processes

continuing

after continuing it shutdowns completely. =[ 

i dont know what else to do, please if this problem has happened to you in teh past. please help me...........