My macbook air is stuck on apple logo and circle with cross flickering

Hi Please help
My macbook air was giving error of memory full and then it switched off and now it won't boot and is stuck on apple logo and a circle with a line flickering
Ive tried:-
holding Cmd+r
holding Opt
Holding Cmd+Opt+R+P
Nothing works. When I held Opt key it only shows Mac HDD and a wifi option underneath it, dont knw why thats there.
Please help me I have a project to finish and don't know what to do with it. I also don't know what version of OS i had.

Start with these instructions:
http://support.apple.com/kb/ts2570
Ciao.

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My macbook air is stuck on apple logo and circle with cross flickering

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