WiFi does not work after disassembling laptop?

Hello friend,many thanks for this video. dv 600 speakers no sound but ext. headphones are o.k. found that the sound cable from the power swich to speakers is damaged or mal functioning. the power switch is powering and well .although I have to apply lot more pressure to pu the laptop on. My question are there different cables which connect the power and sound function or I need to replace only the power cable. Should I only buy the power cable or should I also changre the switch also.Thanks