Partial freeze, then an odd sound

At random as I'm using my iMac G5, everything freezes, I can still move my mouse and I get the multi-colored pinwheel telling me its "thinking". If I was playing music it stops, if I was using Photoshop I can no longer touch what I was doing. And this odd sound emanates from the upper left corner of my iMac. It sounds like a ticking clock. Its not coming from the speakers its from the computer case itself. Then after a few moments, or sometimes minutes, it stops and everything resumes. If I had tried to close a window while it was 'frozen', when the ticking stops and everything resumes the window closes. Its almost like the processor ceases and then comes back or something. Anyone else run into this problem? Please help! I intend to call Apple tomorrow, as it has become very annoying.
Thanks!

Welcome to Discussions - indeed, call Apple, a ticking sound can mean that your drive is dying. If at all possible, back up your data now, try and make a clone of your system using SuperDuper!.
Let us know what happens,

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Windows 7 64 bit: I just upgraded Firefox to 7.1 , I can't watch video on youtube, video freezes, then the browser freezes. I right click on the icon showing the page is open on the taskbar & click close then cancel, it starts then freezes again?

When I watch any video on youtube, every video first starts with short freezes then freezes the Firefox 7.1 Browser window. I have to right click on the icon that shows the browser is open on the taskbar at the bottom of windows and then click on close& cancel to get it to start working again. Also, on any site, I am having problems with links & functions that suddenly stop working, site connections being dropped frequently for no reason, my Modem is stable & internet shows connected. On facebook when I click a button(photos) it doesn't work, in Amazon I click on "submit" and the button stops functioning, in yahoo mail I can click on a button to "send" mail and it won't work. I can open them in IE9 or Chrome but not in Firefox. I have tried disabling all plugins.I also have tried disabling all but flash and still the problems persist. I have uninstalled and reinstalled FF.

Command + R *should* take it to a recovery console. Command + Option + P + R resets the PRAM, but that doesn't sound like your fix.If all of your buttons are working fine on OSX side, I would ignore PRAM / NVRAM / SMC reset tricks, since these are tested as working fine.
I would say you should probably reinstall the drivers for bootcamp. I tried this with 5 in Windows 8 and it gives you an option to repair. The reason I say this is because the UI isn't showing up, which means that it's using another driver.
If this doesn't work, go into device manager and then roll back to your previous settings.
One more thing comes to mind. Do you ever use Parallels or VMWare to load your bootcamp partition? They have their own driver packages which can cause some unwanted behavior when using windows natively.
One last thing you can do is try to by-pass the GUI powerplan entirely. You can use the Powercfg command, which, as it happens, has instructions on how to forcefully set the brightness values. You probably won't be able to make it through these instructions since you will get an error at some point, but that will give us more diagnostic information.
Good luck!

Leopard partially freezes up.

I'll return to my brand new 24" iMac to find network activity is dead, the Dock is completely unresponsive (mouseover does nothing, likewise any other attempted interaction), command-tab is dead, the Apple menu can be accessed, but nothing results from it, I cannot bring up force quit either from the KB shortcut or the Apple menu, some programs will have the spinning beachball of death, others that can be accessed (by clicking on their window, if I'm lucky and it's not covered by a hung program's windows) but upon closing a window or quitting the app it too hangs.
This has happened six times now over a two week period.
To summarise: the Mac's networking is unresponsive (other Macs on the same LAN are fine, it isn't anything other than this one Mac), the Dock is totally frozen, Force Quit cannot be accessed, and apps hang when I do anything more serious than look at them.
I can no longer trust this new Mac to stay up and running while I am gone. This is but one of many annoying issues I am having with it. I've been through three wipes of the HD and clean reinstalls of Leopard to try and fix earlier problems (which still continue to occur). This is also my second iMac. The first was declared DOA in under eight hours. So I'm not having a lot of luck here.
Also - these forums appear to be suffering serious issues. It took several tries to try and post this message. I am getting the errors:
"500 Unable to insert thread into the database: No operations allowed after connection closed.
Resin Professional 3.0.23 (built Mon, 22 Jan 2007 02:25:17 PST)"
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Plus upon login I was asked to create a user account???
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What are you calling a clean install? This article explains the different installation options available:
http://discussions.apple.com/thread.jspa?messageID=607614
If you mean erase and install, it does sound like you have a hardware issue if you are getting partial freezes with no non-Apple devices connected to the computer and no non-Apple software installed. If any of these conditions is untrue, you have to eliminate all other potential causes this way after backing up your data at least twice to verify you definitely have a hardware issue with the computer. Bad RAM can cause such issues as my FAQ* here explains:
http://www.macmaps.com/badram.html
And can often start without warning because no RAM can be tested for errors accurately. If it reports errors in a test, you can believe it. If it doesn't report errors in a test, you can't believe it.
- * Links to my pages may give me compensation.

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*BUMP*
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Thanks for the reply. I have heard that ticking sound. It does not bug me and is not the one I'm writing about. The noise I'm referring to is high pitched sound that comes from the back of the display, around the power cord, when the MacBook Pro attached to it has been in sleep mode for a while. Just wondering if it's a defect and I should bring to the Apple Store. Display is otherwise spectacular and functioning flawlessly.

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~
I've also had some other odd behavior:
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James

You could try [these grey sceen, etc., troubleshooting steps|http://support.apple.com/kb/TS2570] ignoring any duplicaion of what you already have don. And, you could try [these general troubleshooting steps|http://support.apple.com/kb/TS1394] again ignoring duplication.
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"I'd rather be hated for who I am, than loved for who I am not." Kurt Cobain (1967-1994)

My iphone keeps freezing, then turning itself off. Please help me resolve the problem whatever it is

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You said that you restored it. "forgot to mentioned that ive tried all of that"
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iPhone User Guide (For iOS 5.0 Software)

Partial freeze, then an odd sound

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