I tried resetting my pram but now my MacBook won't startup it just stays in the grey apple symbol for 20 mins and then goes to the login page but does not login!

Help, my backscreen keeps flickering and I got told that resetting the pram (alt ctrl p and r) might fix it. But now it won't start up at all. It was working fine befor but now just goes on grey apple screen for 20 mins then the log on page comes up but it won't log in! I don't have the original install disk. I'm not sure what to do and I can't afford to take it to the apple store. What can I do?

See this Apple note: http://support.apple.com/kb/TS2570

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