hello I was told to get the 10.9.4 update by apple. My system is running 10.6.8.. or it was until after i installed the 10.9.4 update and now i cant even log in, my trackpad became unclickable but i could move the cursor... and also i cant log in via safe boot. Now im completely fine with wiping the mac and starting all over... but i have a huge collection of music that i need for Djing with . any help