How damaging is an improper shutdown to a mac? ie can this have permanent 'pysical' damage to your computer & hardware, or does it just have a chance of messing up your files, until you repair disc or permittions, or reinstall the OS? unless of course you have done hardware and disc verification and all has passed? its just ive had to do a few improper shutdowns though no fault of my own and i wanted some peace of mind! many thanks!!