Macbook pro, strange effect on headphone

[mrmatthewkelly]

Hello

My macbook pro headphone output is ALTERING the output sound. The USB next to it is also not working ever since I plugged an external hard drive with what must have been a dodgy power supply. (!!!!!)

It's a very strange effect on the headphones but when I listen to movies the ambient, atmosphere sounds are very loud and the dialogue is very quiet almost missing.

Similarly when I listen to songs (and I do a lot of music mixing on my computer) the vocals are very quiet and other elements are very loud.

When playing audio through my MOTU audio interface or export to CD/memory stick and play on another system there is no problem.

It's like some strange phasing/cancellation issue. I cannot think of any software I have installed that would affect it, though I wonder if there is a possibility it is a software issue. Does anyone know of a way of resetting the audio software? (or something!?!?!!?)

I'm assuming it's probably a hardware issue but thought I'd post this to see if anyone has heard of this before.

Many Thanks!!!!!!

 

[djackmac]

If its one of the pre unibody Macbook Pros, its most likely the the left i/o board which serves as the sound board, magsafe charging board, and left usb port. Not a horribly expensive part (especially compared to a logic board) and relatively easy for an experienced Apple laptop technician to replace.

 

[mrmatthewkelly]

thanks. unfortunately it is the unibody type. do you think that might mean a new logic card??

 

[djackmac]

thanks. unfortunately it is the unibody type. do you think that might mean a new logic card??

(Logic Board) Pretty much...Is it under Applecare?

I guess you can try the usual resets like the SMC and PRAM but other than that...

 

[mrmatthewkelly]

ouch....thanks though. will take it to the hospital.