Just downloaded Yosemite to my iMac (was using latest version of Maverick) and all I get is white screen.

I just attempted to download and install Yosemite OS to my iMac (was using Maverick v. 10.9.5)
After the install and restart, the computer freezes at a white screen and will proceed no further with finalizing the installation.

Appears that you have a hosed installation. Boot into recovery mode and reinstall the OS. Once back up and running, check to see which OS was installed. If Mavericks, then try another Yosemite installation. Hopefully, you saved a copy of that installer outside of /Applications; otherwise, you'll have to waste time, electricity, and bandwidth downloading the ill-designed installer app which blows itself away as part of its installation process.
27" i7 iMac (Mid 2011) refurb, OS X Yo (10.10), Mavs, ML & SL, G4 450 MP w/10.5 & 9.2.2

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