Imac 27-inch 10.9 recovery disk will not start

hello everyone,
I am having boot up problems on my imac 27-inch.
I pressed the power button and press and held the Option key, I chose the
Recovery disk, but the Recovery disk did not start, instead I have the grey Apple logo and it keeps running but will not start.
The imac 27-inch was bought refurbished in late 2010
I also have imac apple care from 2010 never used. First time problem.
On pressing the Option key during startup,
Mach Hard disk and Recovery Disk 10.9 is displayed.
Choosing mac hard disk does not boot up the OS instead I get a big Zero sign with line through it or a big flash question mark sign.
Choosing the Recovery Disk 10.9 does not boot up Disk Utility, instead I get the grey Apple logo.
Please help. Thanks.

Your Recovery HD is damaged. You may be able to repair it using Carbon Copy Cloner 3.5.4. Under the Windowm menu select Disk Center. Select your boot volume from the list. Click on the Recovery HD tab then click on the Create a Recovery volume for this disk. Select Mavericks from the dropdown menu labeled "Recovery HD version to be applied." See if that works. If it does not then see Update - Create Lion RecoveryHD Partition Quickly Without Reinstalling | brunerd. Or see Recovery Partition Creator 3.7 – Updated for Mavericks ...

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