HT1379 I have  lost everything on my mac, a gray screen with a folder and question mark is blinking. i hav another mac that is running slowly, how can I boot and reinstall os x Lion, i do not have the start up disc with me.

I have  lost everything on my mac, a gray screen with a folder and question mark is blinking. i hav another mac that is running slowly, how can I boot and reinstall os x Lion, i do not have the start up disc with me.

Welcome to the Apple Support Communities
Lion uses Recovery to reinstall OS X. Press Command and R keys when your Mac starts, open Disk Utility, erase the drive and reinstall Lion. The other Mac has probably got its hard disk damaged, so take the Mac to an Apple Store

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