MacBook 4,1 MacPostFactor

[spooks115]

Hello to you all I'll just get straight in to it I have a MacBook 4,1 (13- Inch Early 2008) currently with two versions of OSX installed (Lion Primary OS at the moment) and ( Yosemite No Sound ) I have tried numerous suggestions and Kexts to get the sound working but to no success my question is if i was to use Mac Post Factor to do a clean Install of Mavericks would that A have working sound (no need to install kexts) and B ( Then Upgrade Install Yosemite using Mac Post Factor) thanks