Imac freezing and cannot force quit

Imac keeps freezing upon startup and I cannot force quit anything. It just sits and wheel of death. Is this a hardware failure?

How large is your HD & how much space do you have left?
Care to share which OS you are using?
Check out:  Troubleshoot the spinning beach ball/freezing & crashing and  Troubleshoot the spinning beach ball 

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    Lately, some of my applications are freezing up. One is Final Cut Pro, but my MS Word also has in the last few days. When I force quit, the application closes, but if you look on the dock, it still has a white dot next to it like it is open so in order to restart I have to shut down/restart the computer.
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    Woke up the up computer with Mt Lion and totally frozen . cannot even force quit. Is it safe to manually shut it off using on/off button?

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  • Issue when computer is left on for a while and cannot force quit anything

    Hi since updating last week whenever my Mac sits for a while, I come back and I cannot use commant-tab. If I switch between apps (using the dock), I can't. I have to "hide" the top app. the app below will show but the menu panel at the top will still show the "hidden" app. If I try to force quit, the window opens but there is nothing in it to select. I have to reboot.
    If I leave my computer on, this happens. If I put it to sleep when I leave, I can come back and everything is normal.
    I did a disk first aid, but it is still happening. has anyone know of this?
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    Disconnect all peripherals from your computer. Boot from your install disc & run _*Repair Disk*_ from the utility menu. To use the Install Mac OS X disc, insert the disc, and restart your computer while holding down the C key as it starts up.
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    Before deciding that you can't replace the drive yourself, visit the following site and find the step by step instructions for replacing the drive yourself:
    http://www.ifixit.com/
    If you see the instructions and feel that you can replace the drive yourself, you will save money that way. I'm not that familiar with modern iMacs, but I know it was very easy to replace the drive in my old iMac. It may not be as hard to do as you think. If you want extra help, you can post questions on the iMac forum.
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    Select  ▹ Force Quit from the menu bar, then select the frozen application from the list and press return.

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    Sound continues while video freezes - have to force quit. Happens randomly but very often.
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    Hello,
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