hi guys i have already raised this issue but still same problem. story is. i have a mac notebook i bought this lapi from a guy in very cheap ( hope you understand what,s i mean) and it was locked after rebotting it was asking for password and username which i wasn,t knew so the thing i do i just format the hard drive and i installed windows xp on it. when i format the disk volume was muted from kepboard and i just format then after installing xp i do some browsing and almost i installed all drivers instead of audio.i download many drivers and codec packs but useless sound isn,t coming out. now i think its because of volume muted from keypad. every thing is suppose to working just audio isn,t coming out.i had a mac os disk but when i tries to boot it its not working at all. any help guys please thanks in advance your help would be really apprishated.