well t be honest its no my mac its a friend of mine and he says he has deleted some files
by accident and cant get into it now all that happens is a flashing question mark folder
The flashing question mark means that it can't find the operating system, but I doubt if he could have deleted files from the recovery partition by accident.
If he holds down command-R during boot he should be able to access it.
@nara is right, missing O/S or hard disk chuffed. Can't of been done by just deleting a few files, it's like the whole hard disk has been re-partitioned.
Turn it on, at the 'bong' press and hold 'ALT' - see if it brings up any other boot options.
I have a Mac Air 2012 model, and i was able to re-install OSX without any discs straight over wi-fi, took about 45 mins, superb, let me know if you want to know how. I was even able to erase the HDD, and then install over wi-fi, straight from Apple's servers...