Factory reset without disks

Hi there,
My iMac has become a little unstable and I want to wipe everything and start again - a factory reset.
Seeing as it didn't come with any start up discs, is there a way to do with without disks?
Thanks
Moray

What operating system do you have? Lion or other? If other, you can probabably get replacement  original OS X disks from Apple support. If Lion, reboot holding the command + R keys down to enter recovery mode.

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    Wow, sorry to hear of your experience. Seems strange that your disk would just eject like they did. It could be a lot of things but more than likely you just kind of have to start all over.
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    I remember one time I was having a similar problem and don't ask my why I did it but I actually could not get it to install a system. I removed both of my ram sticks, shut the computer down for about 10 minutes including unplugging it from the wall plug, then reinstalled the ram, plugged it back in and started up from the system disk and all worked just fine. To this day I have no idea if pulling the ram helped but I have never had to do it since and for some dumb reason that solved the problem I was having, which is the same problem you are having now. Call it voodoo but it worked.
    Good Luck!!
    Message was edited by: Al Van Malsen

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