Yosemite my iMac stuck on white screen for 18 hours so far

DDownloading Yosemite the software has, I believe, downloaded I have progressed but have now been stuck on white screen for 18 hours. I have my mouse arrow working but nothing to point at. Please how may I tell if anything happening?

Start your computer with the original DVD that came with system and repair your disk with disk utility, also repair permissions.  http://support.apple.com/kb/TS1417

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