Static when connecting to hifi via headphone socket.

When I connect my Macbook Pro to a hifi with a phono to 3.5 cable via the headphone socket, I get a horrible hissing.
This only happens when my Macbook is plugged in, and it is even louder than the sounds it should be producing. Like if I'm playing a song in iTunes at full volume, and then connect it to the hifi, the hissing would be several times louder than the music playing.
It doesn't happen when I unplug the power adaptor.
I have tried it with numerous 3.5-phono cables with the same outcome, and I've used various other sources instead of the macbook such as iPod/cd players and they all play fine.
Anyone know what can be done about this?
I have PC speakers which work fine with it.
Also recently my headphone socket seems a lot more...delicate (I haven't slept in a while and can't think of the word - sorry).
Basically when I first got my mbp it was fine, but now if whatever is being plugged into the socket is nudged slightly, it will cut out temporarily. This happens regardless of what is being plugged in.
Thanks

I also have a macbook pro and an Apple Hi Fi. For one thing, you have to baby the Hi Fi, they can be pretty finicky and delicate and it doesn't take much for them to malfunction which I believe is part of the reason that Apple discontinued them. I also use a 3.5mm jack- 3.5mm jack to connect my macbook pro to my hifi and have no issues. Now what it sounds like is going on is that the issue is on the Macbook Pro side of things. How old is your MBP? Is there any light emitting from the audio jack on the laptop, as that can be an indicator of trouble. I get that hissing sound too so I'm pretty sure I know what yours is caused by. Basically, when a 3.5mm audio cord is plugged into the Hi Fi on one end but not properly into something at the other end, and the unplugged (or partially plugged) cord touches something else conductive/metal it will hiss really loudly. This should only occur when the Hi Fi's volume is turned up. Have you checked any other devices (output) like another speaker if possible to see if your mac's audio out port (the one with the headphone icon on it) is broken or malfunctioning. I am using a Belkin 3.5mm-3.5mm audio cord and it works well. So I'm guessing the issue is your audio-out but if all else fails it is possible to connect a macbook pro to a Hi Fi with a Toslink fiber optic cord. I don't know why this would fix the problem but if you truly have no issues with any other input to the hi fi and you have tried multiple audio cords (when audio cords get worn in my experience they will cause problems too, but that problem would likely present as getting single-channel audio interference (which would sound like listening to an ipod with headphone) then maybe a digital audio cord is the way to go. On top of that, a digital audio cord would dramatically improve the volume and sound quality (its roughly the difference in sound between listening to music on a docked ipod vs. plugging an ipod in via the audio out auxiliary jack). But, I would say your likeliest problem is the connection between the audio cord and the audio out port on the macbook pro. Hope this all helps!

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Static when connecting to hifi via headphone socket.

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