My speaker's aren't working.I used to use the monitor speakers as I dont have the normal ones.They used to work properly until the computer crashed.I got it fixed and every thing alse expet the audio part is working.I tried connecting my head phone but it still doesn't work.what should I do?And what the heck are sound cards.I saw thet term a lot of times while searching on the net for answers.We have been trying to fix this problem for over 2 months.A little help or advise will be very much appreciated.