Your original OS X system is running) then reboot: If the installer hasn't yet restarted your Mac to install Mavericks (ie. Don't interrupt the process immediately - installation can take a while and in many cases any slight flaws will be automatically repaired by the installer, so give it an hour before moving to the next step. You're installer runs fine but progress has halted. Reboot normally and try the installation again - it should work. Hold down Command-R immediately after hearing the boot chime on startup Some Mac users receive an error message warning the OS X Installer thinks their disk may be damaged when they begin installation. Try again a little later to avoid the crowd. An estimated 11 per cent of Mac users have already installed the OS, so lots of people are downloading the software simultaneously.
If your Mac App Store download stops progressing quit the Store, restart your system and try to download Mavericks again.
