Restoring my imac from an external harddrive

hi, i have made a backup using time machine on my imac 5 days ago onto an external hard drive. and i have started deleting stuff off my computer and noticed that the time machine had started making back ups automatically everyday. but now i would like to restore everything that i deleted to the way it was 5 days ago.
i started checking online for help and support and came across some fourms stating that to do so i need to have an installation disc, but when i bought my imac, it came with nothing.
what can i do to restore everything without the disc?
someone please help

Hello Rikaruz
Welcome to Apple Discussions
With the drive connected and your install disk in the drive, try holding the Option key while restarting the iMac! The iMac should startup in the startup Manager and hopefully give you the option to startup in either the Macintosh HD or the Install Disk! There may not be any need to reinstall the OS X, once your booted from the Install Disk, go up to the menu bar and select Disk Utility and try to repair the Macintosh HD.
Dennis

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