Mac turns off after it loads?

Hi, I've tried to turn my mac on and the grey screen comes up along with the chime, the apple and the loading bar. However, once the loading bar has fully loaded it turns off! Any suggestions? I'm in a slight situation as it doesn't usually recognise the keyboard until the login page comes up and I don't have a recovery disk, any help would be appreciated..thank you

Go step by step.
http://support.apple.com/kb/TS1365
Note: Steps 5 and 6
Step5
Reset SMC. http://support.apple.com/kb/HT3964
Choose the method for:
"Resetting SMC on portables with a battery you should not remove on your own".
Reset SMC, hold the keys down for 20 seconds or more.
Keep it charging for 2 hours or more.
Best.

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