Hi all This evening I was in the process of factory resetting my iMac early 2009 (which has Yosemite). Whilst trying to reset using Disk Utility, I was having some difficulty resetting the drives as I realised I have a Bootcamp partition. I tried to delete off the Bootcamp partition but the disks kept saying it was unable to unmout the disks. However I was able to erase all content from both Mac HD and Bootcamp, several times. In any case, I did do a backup although this was a bit of a cockup . I used my backup USB external HDD to reboot the comp and found that it was rebooting back to OS 10.5.8 which was the backup from a couple of moths ago rather than earlier today. To cut the long story short, after rebooting from the backup disk, I went back to disk utility and was able to remove the Bootcamp partition. However, I restarted my computer and noticed that there is now no longer a Recovery HD, and the original Mac HD logo isnt there anymore either. I can only start up from my external HD and not the internal HD. Worryingly, when I am browsing around through the external HD, I am still able to access the internal HD but now it was it is 290 GB (instead of 320 GB - the boot camp partition was 30GB so somehow I have deleted this partition rather than restored it back to Mac!!!) I just want to completely restore this darn machine back to factory settings so I can sell it. I've lost the original DVDs so feeling stuck. Please can anyone help me?!!!