Boot problem cannot access to login/passwords session

the imac is opening well, doing is music, displaying the turning wheel......and then nothing. it goes with the rainbow spiral for ever.  any tricks to help me out? thanks.

Hello!
I have the same kind of problerm : my new iMac (late 2013, 27", i7) doesn't seem to boot, with the wheel spinning forever!...
Actually, it does stop spinning, and the Mac boots, after ......................... 8 minutes and 30 seconds!!!
After that, it seems to run perfectly! The RAM is well recognized and the computer works fine. But if I reboot, it' starting over
Notice that when I reboot from the login page, it works perfectly : boot within a few seconds!
It seems that it began after I added 32 GB of Crucial RAM, but it doesn't disappear after I remove that RAM!
I tried all the "classic" resets (SMC, PRAM...) but it didn't fix anything.
Apple changed my Mac for a brand new one, but I have exactly the same problem with the new one...
Can you tell us more about your config? Is it the same as mine?
I don't know what to do, since the Apple hotline offers no solution.

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