27 ", late 2010, iMac won't boot after turning on. Spinning beach ball and white screen.

Probably a relatively simple fix, or series of steps, that will return it to normal.

BD,
It's been a while, but I have since upgraded RAM to 12Gb and gone to Mavericks 10.9.4. Everything has run well until recently. Time Machine will not function on a new Seagate, 1TB GoFlex external HD,even though it was properly formatted and HFS journaled. Seagate techs said it seems to be a failing drive, yet it works perfectly on my laptop, a 15" MacBook Pro with Mountain Lion. The drive completes less than 10% of the backup before it locks everything up on the iMac with the spinning beach ball and a gray screen. Left it that way for two days and no change. Removed the drive physically and the iMac works just fine. I am baffled and really a bit frustrated here and wonder if you, or anyone else, has an idea about correcting this? I am suspecting that there is something deeper in the system going on than I am seeing.
I have run a verification of Disc Permissions/Repairs and keep getting this coming up: "Permissions differ on “Applications/Safari.app/Contents/Resources/Safari.help/Contents/Resources/inde x.html”; should be lrwxr-xr-x ; they are -rwxr-xr-x ."
That keeps coming up every time and is not fixed. I don't know if that has anything to do with that.
Baffled...

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IMac won't boot after power outage

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Help!
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Hi Chris Lee 310,
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Click on the link below to see more details and screenshots.
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Hi Everyone
I'm currently working on 2 separate corporate films - Both require work done in Premiere with Dynamic Links to After Effects.
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1 has video footage shot from a Canon 5Dii (H.264 Mov files)
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You could try this for a check...
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IHTH

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Combinations I've tried are:
1-Old
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3-Old
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3-New
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1-New
2-Old
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1-Old
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1-New
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1-Old
2-New
3-New
4-Old
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1-New
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3-Old
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CLICKY CLICK---> iMac: How to remove or install memory
Or
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my iMac late 2013 3.4Ghz quad core i5
Conflicting info. Your system profile shows: Mac Pro, Mac OS X (10.6.8). Please update/correct.

27 ", late 2010, iMac won't boot after turning on. Spinning beach ball and white screen.

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