Upgraded imac to mavericks, now won't boot, stuck on white screen then reboots in a loop

i have a imac that i upgraded to mavericks, it wont boot up now, sticks on white screen for a while the reboots and sticks again, if i reinstall osx will it delete all my data- i tried to start the new install in recovery mode but it kep saying incorrect username and/or password, but i ts not incorrect and when i hit the forgot password link nothing happens

If you can get it to boot once the first thing you should do is backup all your data using Time Machine or better yet create a Bootable Clone using SuperDuper or Carbon Copy Cloner. What Apple says to do to trouble shoot is in Gray screen appears during startup. 
I would also recommend running Apple Hardware Test in Extended Mode, if no errors appear the first time run the test 2-3 more times. Each Extended Mode test will take 30-60 minutes.

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    If you can get it to boot once the first thing you should do is backup all your data using Time Machine or better yet create a Bootable Clone using SuperDuper or Carbon Copy Cloner. What Apple says to do to trouble shoot is in Gray screen appears during startup. 
    I would also recommend running Apple Hardware Test in Extended Mode, if no errors appear the first time run the test 2-3 more times. Each Extended Mode test will take 30-60 minutes.

  • Mac pro won't boot: stuck on white screen, HD is new

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    Hey jlee12489,
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    - Check your cables and power source
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    Hi,
    After using iDVD I had the dreaded "ate the disc" issue, with the typical grinding noise and the lack of ejection. I figured I would play it safe, power down the machine so it wouldn't be reading it, and boot it up again and eject it using the keyboard / mouse button options that are suggested here.
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    Message was edited by: productiondesignermatt
    Message was edited by: productiondesignermatt

    Ok, now it appears to have booted, but the disk is still in there. I'm doing a full Time Machine backup (justincase), but after that... what to do?
    I really can't be without this machine for two weeks and it was a custom order so a replacement isn't going to happen.
    As someone who works for Apple's biggest UK reseller, am I seriously having to reconsider whether I even want to work there any more - no reflection on my employers, obviously, but this is 3 bad machines I've had from Apple in one year and the return rate I've started seeing on hardware is utterly appalling.
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  • 10.6 won't boot; stuck on grey screen

    I know this is covered here to some degree, at least, but I haven't been able to find a complete solution/answer, so here goes:
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  • Macbook pro won't boot, stuck on white apple screen

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    If your computer is still under warranty or you have Apple Care, take full advantage of it by letting tech support deal with your problems.  It's what you're paying them for.
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  • Mac wont boot, stuck on white screen

    Hi
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  • Won't boot--stuck on grey screen...

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    Message was edited by: NGrignon

    I don't know where is my old PB G4 install disk, so I can't try that.
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