macbook 6.1 does not start
White MacBook 6.1 doesnt start up. I get the Apple splash screen, and a spinning wheel for 4 hours.
A little history;
The laptop was purchased in late 2010, it was upgraded to 8gb ram and OS Lion. It was running great. Then I gave it to my daughter for school. She returned the laptop saying that it had did not start up anymore. i then tried reinstalling the original OSX SnowLeopard. This seemed to work however the laptop was still very slow. I tried to update to Mountain Lion and that's when It stopped booting up. Any suggestions would be appreciated.
MacBook, Mac OS X (10.7)