My 27" iMac Freezes, Won't boot from DVD

My iMac has started to freeze up every few minutes. Every so often, it becomes unresponsive; the mouse cursor still moves (sometimes it turns into a beach ball), but I can't click or type anything. Whenever this happens, the hard drive begins to churn as if it's reading or writing something big. This usually lasts only about thirty seconds to a minute, but it's happening with frustrating regularity.
I've been trying to troubleshoot this for a few days, now. I'll walk you through the steps I've tried so far.
I ran a check on the hard drive with Disk Utility. This came back with a message about the files/directories not matching up with their expected counts. The solution it suggested was to boot from a Snow Leopard disc and let Disk Utility run a Repair Disk while the startup drive is not mounted. It was at this point that I realized that I couldn't boot from the dvd. Whether holding 'C' or 'Option', when it tries to boot from the disc, it gets to the Apple logo and then hangs.
I kept researching and found a workaround; boot into Single User Mode and perform fsck, which fixed the Disk Utility error, but did not solve the freezes/noises, and I still can't boot from the dvd.
Any ideas?

Thank you for your prompt response.
Well, I'm not sure if I explained it clearly. Holding the Option key does indeed bring up a list of bootable devices. The problem arises when control is passed to the Snow Leopard disc. The Apple logo flashes, I can hear the optical drive being accessed, but then it locks up.
I should also clarify that it's not the disc that came with the iMac. I just moved and can't find the original disc, so I borrowed my neighbor's (which came from a Macbook he bought after mine (which I bought last year)). I am under the impression that Macs can't boot from discs that are older than the version of OS X that they shipped with. I wouldn't think that's the issue, here, as his came out later than mine, but I've still got a lot to learn about life in the Appleverse.
My data should be safe--I've got an up to date Time Machine backup on an external drive. The performance issues aside, I'm really looking to understand the underlying problem(s) here.
So, one option is that the RAM might be bad. I can test that by swapping out each DIMM and checking if the problem is resolved. One thing I don't understand, though, is why bad RAM would manifest as the hard drive being accessed. Is there a definitive way to test the logic board, as there is for testing RAM?
Also, I keep thinking of other little syptoms which may or may not be related.
Recap of Symptoms:
Magic Mouse occasionally loses its magic (right click, multitouch, etc.) and needs to be turned off and on.
Free disk space fluctuates by as much as eight gigs (without my intervention).
System stalls (accompanied by HD access sounds) multiple times per hour.
Can't boot from dvds (though, this could be a version problem).
**Fixed: Disk Utility Verify Disk error.
I do understand that this might be a hardware error, and I certainly know how much trouble that sort of thing is to find/fix. I'm definitely willing to open the case and swap out DIMMs and drives, but not until I've exhausted my software solution options. *crosses fingers*

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Hey,
New member here.
I have an Imac 20" 1.8 Ghz PowerPC G5, running Mac OS X 10.4.9.
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To Apple Discussions.
Please check out the following thread which the original posted had the same error you had.
http://discussions.apple.com/message.jspa?messageID=4459207#4459207
You may find some helpful troubleshooting solutions in the above thread.
Make absolutly sure you are using the "DVDs" that originally came with the computer.
Also, see Knowledge Base Article; http://docs.info.apple.com/article.html?artnum=106805 Mac OS X: "Broken folder" icon, prohibitory sign, or kernel panic when computer starts

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After verifying my HD with Disk Utility, I had a message claiming the volume is corrupted.
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It freezes on the Apple logo after chiming and searching briefly the CD driver, which buzzes normally, then goes idle.
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Hello all --
I have read a few other threads that have similar issues, but slightly different.
Today I went to get a new internal HD for my MacBook Pro 15"... just swapped it out at the store and put the old one in an external enclosure. No problem there. Got home and went to put the OS on the new internal HD. The MBP would not boot from the OS X 10.5 DVD. Weird, I thought. Tried a few more times - holding down the 'C' key, the 'option' key and so on. Each time it failed to boot -- it would just reboot after getting to the grey screen (no Apple). However, the machine would boot from the old HD in the external enclosure via USB port. Everything appeared normal, the DVD mounted and the new HD showed up in disk utilities - and I was able to format it ... tried rebooting to OS X DVD with no luck
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Seems to consistently work with the old HD inside the MBP and not the new drive.
There is an OS installed on the new drive (it shows up in Startup Disk preference, and when holding down option key at startup).
The new drive will show up as an external when it's in an external enclosure connected to the MacBook (the old one back inside the MacBook).
I did format GUID and Extended (Journaled).
The MacBook Pro 15" unibody late 2008 2.4GHZ -- this one: http://support.apple.com/kb/SP499. It has 4GB RAM, the 250GB 7200 RPM drive.
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Never had any issues with the machine previous to this.

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I get the chime, screen lights up, thinks for a bit, and if you use your imagination you can almost hear the DVD spin up. Then the screen goes black, lights up, chime, thinks a bit, goes black, lights up, chime and so on
I've tried booting from an external bootable clone I created with CCC (firewire external HDD), and same symptoms.
I even tried swapping in a hard drive that I know has a working bootable copy of Leopard on it, and then all I get is the eternal cycle, without pressing any keys on startup.
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Raj wrote:
That is not the reason it didn't work. Here is the actual clarity:
*A retail Leopard DVD should be able to boot a new Macbook Pro unibody.*
So you are saying even if the driver for the controller on which the DVD drive sits is not available in the Leopard DVD you are using because the hardware was not manufactured at the time the Leopard release on the DVD was made, the OS should magically just boot? How is that possible? Unibody MacBook Pros have entirely NEW AHCI chipset - for which there won't be any drivers on the older Leopard DVD and as such the DVD wont be detected once the OS on the DVD loads. In cases where the chipset used is same (as in previous generations of MBP) it will boot.
The key difference here is that if you used an older version, some new hardware may not be supported - however, the computer *should still boot from the DVD*, which is the subject of this discussion.
The OP said that his computer boots from the DVD that came with the computer - just not with the old retail Leopard DVD. Also - what should happen if the new hardware happens to be the controller on which the DVD drive is sitting? How will it be able to read the DVD? What about the graphics card? If the drivers on the old leopard disk do not recognize the new graphics card - how is the OS going to display on screen?
On my way home, I stopped at a Mac store and asked them to test this. They successfully booted a new Macbook Pro unibody from an older Leopard DVD. And this is why Apple is replacing my computer, because it is a hardware issue, not a software one.
Again - you fail to understand that whether or not the old DVD boots on a new machine all depends on how much hardware has changed and what hardware has changed. It may boot on some generation of machine because the basic chipset and graphics did not change or were handled generically by the drivers on the older DVD but it may totally refuse to boot on new gen machine which has totally different / incompatible hardware.
So your claim that any old Leopard DVD must continue to boot on any new machine is not really technically explainable.

BRAND NEW LENOVO K300 5316 1BU (WON'T BOOT FROM DVD SUPERJULTI DRIVE/CD-WRITER

Would appreciate info from the Lenovo Community as to what might be the problem and a fix.
I just received my new Lenovo K300 5316 1BU. As one of the first tasks I made a Lenovo Repair Disc.
To test my disc I rebooted my computer with disc in drive. During reboot I pressed F12 to get to the proper menu.
I chose the cd/dvd drive as the first boot option. It showed that the drive was recognized stating Boot Priority but then went directly into my Windows 7 deskop.
I called Tech Support and tried everything with them with the same results.
They instructed me to do a complete System Restore to see if that corrects the problem.
I have not done this yet since I will do a backup of my present setup, not to loose all my hard work and time setting up all my programs and settings.
Before I do a complete system restore I would appreciate any comments or suggestions from the community regarding this situation.
Do you also believe that doing a full system restore will help or should I send this computer back?
I do find it hard to believe that a computer less than a week old would have this problem with the DVD Supermulti Drive /CD writer.
If I still have no success after a full restore or a resolve from the Lenovo IdeaCentre Community then I will return this computer back to TigerDirect.
To conclude I would like to mention the following regarding this brand new Lenovo K300 5316 1BU top of the line desktop computer.
One of the reasons I purchased this particular desktop was because of the Lenovo Windows 7 ENHANCED operating system that Lenovo has been advertising so much.
To my surprise and disappointment, this BRAND NEW Lenovo Windows 7 Home Premium 64bit does not have the Enhance version, it is Windows 7 Home Premium 64bit only.
Apparently, Lenovo is making some with Enhanced and some without.
Finally, another reason I purchased the 1BU version is because it has a TV Tuner.
To my surprise again, the TV Tuner card in this model does not have an FM Tuner, which almost all TV Tuner Cards have. So, as a result, no FM Radio with Windows 7 Media Center.
Thank you for taking the time to read this long post, but thought it was important to share with the community.
Comments and Help will be most appreciated.
MateusMan
Moderator note; e-mail address removed to stop the spambots getting it

What brand DVD drive did you install? Some third-party drives won't boot by holding down the C key at startup, because they lack the Apple/OEM drive's ROM programming. I recently installed a Memorex (manufactured by LG) DVD burner in a B&W G3, which is recognized by Toast and (with PatchBurn) the iApps. The compatibility problem occurs when selecting a CD/DVD as the startup disk using the Startup Disk Preferences/control panel or by holding down the C key during the restart. In either case, the drive ejects the disk during the POST, so that I have to immediately close the tray and hold down the C key again, to persuade it to boot from the disk. Is this similar to what you're experiencing?

My 27" iMac Freezes, Won't boot from DVD

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