My Mac Pro can not start up

Hi everybody,
I am using Macbook pro, Processor 2.5 Ghz intel core i5, memory 4gb 1600 Mhz DDR3 and OS X version 10.9.1. The last time when i turned off, it still worked normally, but now when i start up my Mac, it didn't work as it just appeared the grey screen with apple and a loading symbol. I wait for about 15 minutes and even 30 minutes but it still can not enter to the main screen. I don't know what's happen with my Mac.
Beside, i feel the OS X version 10.9.1 make my MAC slow down and even be unstability , i don't know why and how to solve it. Thus, Would you please help me to solve my problem?
Thanks in advanced.

Hello Khanpnl199,
Thanks for using Apple Support Communities.
For more information on this, take a look at:
Mac OS X: Gray screen appears during startup
http://support.apple.com/kb/ts2570
Best of luck,
Mario

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