Hp Dv2130ea

Hi Guys & Girls

I have a intel T5500 166 Mhz dv2130ea that i believe was running on xp
i built it up from spares and keep it as a spare because we have quite a few laptops in our household
for the grand children and my sons etc

the problem with it is :-
i fitted a working motherboard purchased from ebay
fitted a reconditioned formatted hard drive with no recovery on it
loaded windows 7 home premium on it tried 32- and 64 bit

i have sound coming through my speakers
i have sound coming through my headphones
But when i plug the headphones into the laptop it does not mute the speakers as it should
also when zeroed or muted the sound can still be heard very low from the speakers
so i cannot completly make the speakers silent
so when my mum plugs in the headphones to watch her soaps i can still slightly hear sound from the speakers
also when i press the audio tab on the media bar it does not turn orange

Now i have replaced the media cable on the media strip and when i un install the audio the tab turns orange

i have changed the speakers
the audio media cable and the media power button strip
also the audio board in the front where the jacks are
flashed the bios

tried almost every UAA driver that i can find
re satarting before installing the audio

tried almost every conexant audio driver that i can find even tried a couple of realtek drivers

installed what i believe to be the correct chipset

i'm really stuck on this one dont know what to try next

any ideas would be appriated
many thanks in advance
Maggie