I bought my MacBook pro in May 2012. for whatever reason the screensaver will not turn on. Took it in to genius bar. They said the software had to be deleted and reloaded. Which they did around 3 weeks ago. Everything was working fine. Now anymore again

Is anyone else having problems with their screen saver not turning on?  My was working when I first bought the lap top. Then it stopped activating, I could get it to come on from a hot corner, or if I powered off the lap top and the next time I would boot on it would work for a few days but then it would stop. Made an appointment with the Genius bar and they suggested to wipe clean the HD and re-install the software Mountain Lion.  Which was done.  It worked fine for a few weeks, now it has stopped again, and I can not even get it to stay on by activating it from the Hot Corners.
Anyone else having the same problem?  And if so what have you done to try and correct it?  Apple ran a check on my MacBook and they said there is nothing mechanically wrong with the MacBook that it is the software?????

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