Anyone had any issue with the audio-in of the Macbook Pro 13" 2010? I purchased the MBP on Oct '10 and since the beginning it will only works with selected earphone/headphone. The original apple earphone from iPhone is working with my MBP but when I tried other brands such as Altec Lansing, it won't work. The sound keeps coming from my speaker instead of earphone. I also notice that it has better chance to works with the straight type of jack rather than the L-type. What type of audio jack should work with MBP 2010?