This morning when I booted my mac pro I got this error - The system extension "/System/Library/Extensions/IOStorageFamily.kext" was installed improperly and cannot be used. Please try reinstalling it, or contact the product's vendor for an update. How do I reinstall it ? How did this happen ? Now it seems I can only boot from my main boot drive in SAFE MODE, but still get that error above. If and when I try to boot normaly I get the startup chime and that's it, cannot see what is going at this point as my graphics card has no EFI boot. Any help would be really good on this.