Imac does start up after trying to install yosemite. I got nothing but white screen.

My Imac does no start up after trying to install yosemite. I got nothing but a white screen.
I am doing this on a pc
I have disconnected all the USB and wifi. When it reboots I see a timer bar then a white screen.

Please clarify, are you attempting to install Yosemite on a PC and not a Mac?

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yes, after i click on the icon the hour glass shows up. and yes i have norton anti virus
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Imac does start up after trying to install yosemite. I got nothing but white screen.

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