Yosemite wont install on my iMac and every time i restart my iMac it goes back to installing

I had an iMac that was running really slow and had lots of useless junk on it so I decided to get the newest operating system and have everything erased. I went ahead and began to install Yosemite but every time the situation would result in the same way, "There was a problem installing Mac OS X Try reinstalling." I tried many times to go into recovery mode but it would just take me back to the Yosemite installation. Please help me and Thank You...

Exactly which iMac model do you have? The following explains how to find it.
To find the model identifier open System Profiler in the Utilities folder. It's displayed in the panel on the right.
Post the result here:
To post screen shot do this:
Press COMMAND-SHIFT-4 which will change the cursor to crosshairs.
Hold down the mouse button and use the crosshairs to select the part of the screen you wish to capture.
Release the button and the image will be saved to your Desktop.
Click on the Camera icon in the toolbar of the forum message editor.
Drag the image onto the Choose File button and click on the Insert button.

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Yosemite wont install on my iMac and every time i restart my iMac it goes back to installing

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