Hello all,   I have a MBP 5,1 (late 2008) and over the last few days it is giving me serious grief.  First the battery went pear shaped (second time this has happened) and because of the shape the trackpad would no longer work.  Okay I ordered a new battery.  Now there are several other things which have gone wrong.  I am currently using mains power with no battery installed.   1.  Audio  Two days ago the sound out of both speakers was distorted.  I could fix...