First of all i would like to suggest that you must maintain backup of your valuable data so that you don\'t face problems in such critical situations. But since you have not maintained any backup then also you don\'t need to worry because you can access your hard disk data by restoring them with the help of Mac Data Recovery Software.

If your damaged iMac late 2009 OS X is booting properly and you are able to start it then you can use this software to restore the data. But in the case it is not working and you are unable to start then you have to connect the damaged hard disk to another Mac Mini and then execute Mac Data Recovery Software to restore the inaccessible or missing files. With the help of this effective software you can easily get back your data even in the conditions of hard disk failure. So, you must try this.