Insert system disk, then select restart. or
install disk, hold power button down until machine shuts off. then hold down c key and push power button. Hold c key while machine boots from optical drive.
Macs shipped after July of 2011 don't include system discs.
To reinstall the OS on Macs made since then, you need to use OS X Recovery.
Here's how:
Eventually you'll see the recovery screen, from which you can reinstall the OS.
Note that if you've just installed a new hard drive, it won't have the recovery partition installed. In this case, you'll need to be connected to an Ethernet or Wi-Fi network. It will download the operating system from Apple's servers. This is called Internet Recovery, and it can take much longer, depending on the speed of your internet connection.
If Internet Recovery isn't working, for some reason, you can force your Mac into internet recovery mode by holding down the ?-?-R (Option-Command-R).
Why you want to reinstall the OS:
* System affected by virus,worms,spams and bluescreen
* Any OS issues and you are not able to get into windows
How to reinstall the OS:
* Normally in a computer to reinstall OS and the drivers it may take about minimum of 1 hour but using the dell partition we can do it in 25 mins and you don't need to install drivers seperately
To reinstall OS (Windows XP):
* While turning on the computer in the Dell screen you need to press control +F11 keys simultaneously
* Once you do that it will take you to a different screen were it will ask for your confirmation to reinstall the OS
* Once you confirm it the reinstallation will take place and the computer will reboot
* After that you will be prompted to provide informations like date and time zone,computer name and such things
* After this it will get into the regular desktop screen..
* All the drivers will be preinstalled other than the softwares that you installed on the computer
To reinstall OS (Win Vista or Win 7):
* While turning on the computer in the Dell screen you need to press the F8 key
* This will take you to the advance boot option were you need to select Repair my computer
* After that you need to select the Dell image restore or Dell factory restore
* Follow the onscreen instructions and it will ask for your confirmation to reinstall the OS
* Once you confirm it the reinstallation will take place and the computer will reboot
* After that you will be prompted to provide informations like date and time zone,computer name and such things
* After this it will get into the regular desktop screen
* All the drivers will be preinstalled other than the softwares that you installed on the computer
Note: Please take a backup of all the files before reinstalling the OS
If you dont have the default dell partition then you need to reinstall the OS using the CD
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