Screen on my iMac mid 2011 goes white and I cannot continue

Hi the screen on my iMac mid 2011 goes white and I cannot continue. I tried doing a shut down and re-start, no luck

Work thru the setps at > Mac OS X: Gray screen appears during startup
Then if the problem is not fixed by the time you get down to the "Preform an Archive and Install of Mac OS X" section, go to > OS X: About OS X Recovery

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    I have had a number of issues with my Intel Mac recently and had to reboot using disk utilities, safe mode, OSX recovery, but always come back to the login screen but when I type my password the screen goes white and returns to the login screen. My password is correct and the login does not jiggle as it would if the password was wrong. Please advise,

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    Hello,
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    Hello,
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