My screen got totally white after updating to Yosemite

Uploaded the Yosemite to my IMac.
When installing the new update (running OS10.6.8 before) the computer restarted during installation.of program.
After that the screen is just totally white. What happened and what shall I do?

Thank you.
I’m writing from a PC at the moment.
Thanks for the answer. I can’t save anything now, the computer is ‘dead’ it is a shame on all I have on the computer.
And all this problems because of my banc who wanted my to update in order to put in a special identification program.
Who shall I blame?
I have to rebote my computer.
I am crying… ☹
Harriet
Från: Apple Support Communities Updates [email protected]
Skickat: den 17 februari 2015 22:44
Till: Aqua Produkter
Ämne: - My screen got totally white after updating to Yosemite
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Kappy<https://discussions.apple.com/people/Kappy?ac_cid=op123456> has replied to your question. You can view the full discussion<https://discussions.apple.com/message/27684871?ac_cid=op123456#27684871> in Apple Support Communities.
My screen got totally white after updating to Yosemite<https://discussions.apple.com/message/27684871?ac_cid=op123456#27684871>
Can you reboot the computer to Snow Leopard? If so, then re-run the Yosemite installer application. It should be in your Applications folder.
If you can't, then you need to erase the drive and reinstall Snow Leopard:
Clean Install of Snow Leopard
Be sure to make a backup first because the following procedure will erase
the drive and everything on it.
     1. Boot the computer using the Snow Leopard Installer Disc or the Disc 1 that came
         with your computer. Insert the disc into the optical drive and restart the computer.
         After the chime press and hold down the "C" key. Release the key when you see
         a small spinning gear appear below the dark gray Apple logo.
     2. After the installer loads select your language and click on the Continue
         button. When the menu bar appears select Disk Utility from the Utilities menu.
         After DU loads select the hard drive entry from the left side list (mfgr.'s ID and drive
         size.) Click on the Partition tab in the DU main window. Set the number of
         partitions to one (1) from the Partitions drop down menu, click on Options button
         and select GUID, click on OK, then set the format type to MacOS Extended
         (Journaled, if supported), then click on the Apply button.
     3. When the formatting has completed quit DU and return to the installer. Proceed
         with the OS X installation and follow the directions included with the installer.
     4. When the installation has completed your computer will Restart into the Setup
         Assistant. After you finish Setup Assistant will complete the installation after which
         you will be running a fresh install of OS X. You can now begin the update process
         by opening Software Update and installing all recommended updates to bring your
         installation current.
Download and install Mac OS X 10.6.8 Update Combo v1.1<http://support.apple.com/kb/index?page=answerlink&url=http%3A%2F%2Fsupport.apple .com%2Fkb%2FDL1399&answerid=16777216&src=support_site.downloads.search>.
Correct Answer <https://discussions.apple.com/email/thread/6836494/correct/27684871> Helpful Answer <https://discussions.apple.com/email/thread/6836494/helpful/27684871>
Use the buttons above to tell Kappy and the rest of the community if this reply solved your question or helped you get closer to finding a solution.
To reply to Kappy, go to the discussion<https://discussions.apple.com/message/27684871?ac_cid=op123456#27684871> in Apple Support Communities.
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