Test for freezing iMacs

Hello.
I am awaiting a new iMac, and though I realise it's a relatively rare condition, like many others I am anxious not to get a freezing one. I think it would be great if people could post "tests" for people to run on their new iMacs - i.e. processes or applications or combinations of applications that seem to bring on a freeze. This way, folks taking possession of new iMacs can subject their machines to some questioning as soon as they get them - and therefore remain within their 14 day return/replacement rights should patterns of freezing arise.
So, could a few people with freezing problems perhaps list some issues that commonly (or, even better: reliably) cause a freeze?
Thanks

Here's what I did (all at the same time):
1. I ran iTunes visualizer with the window open all the way so it was as close to full screen as I could get without hitting CTRL-F.
2. I played a mini-movie in PhotoBooth that I had recorded earlier. It was 2 minutes long.
3. I opened iPhoto, selected a photo, blew it up, and continuously rotated it using CTRL-R.
All of that, and I randomly went to my screensaver (Arabesque) and put it in sleep mode and woke it abruptly.
I've been testing it this way for a few hours and haven't had one glitch yet. A couple of slow-downs, but no video problems.
Hope this helps.
Chris Orcutt
http://www.orcutt.net

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No checks are necessary however if you feel you must then run Apple Hardware Test in Extended Mode and that should be about all that's needed. However to be totally honest IMHO that is a complete waste of time. What I'd recommend you do is get your PC ready to migrate your data, when you first turn on the new iMac it will start a process called Setup Assistant, part of that is asking if you migrating from another Mac or PC. Pondini does an excellent job explaining SA and how to migrate successfully in Lion or Mountain Lion Setup Assistant tips
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Hi there, I'm posting my question in advance as my iMac i7 has still not arrived.
When it does get here, it will be my very first Apple Computer.
What tests do I need to run to check it for Flickering, or any other problem that folks seem to be having.
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Hi,
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Well, I found out that the problem is not with the Paragon rescue disk, but with the inordinate amount of time my iMac takes to recognize non-OS X bootable media. I'll explain...
After trying several different manufacturer's media and still getting the same frozen system, I was about to give up. As a last resort I was going to try putting the media on a USB stick, but my stick was in the car. I ran outside to get it from the glove compartment and headed back to the family room. I looked at my iMac's screen and there was the Paragon Hard Disk Manager main screen!! I couldn't believe it; the media and the burn was good after all.
Taking my iPhone and getting my stopwatch app, I powered off my iMac (with the rescue disk still in it), turned it on, and as soon as I heard the gong, I pressed the 'c' key and hit 'start' on the stopwatch. I was astonished to find that it takes 1 minute 48 seconds for the iMac to begin the boot process. No wonder I thought the disks were causing my iMac to hang. I was sitting on the white screen or the volume chooser bar for almost 2 minutes while my iMac did.....nothing. No spinning disk, no progression bar (like sometimes appears when you boot OS X and there's a system problem), no nothing.
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Mac users often ask whether they should install "anti-virus" software. The answer usually given on ASC is "no." The answer is right, but it may give the wrong impression that there is no threat from what are loosely called "viruses." There is a threat, and you need to educate yourself about it.
1. This is a comment on what you should—and should not—do to protect yourself from malicious software ("malware") that circulates on the Internet and gets onto a computer as an unintended consequence of the user's actions. It does not apply to software, such as keystroke loggers, that may be installed deliberately by an intruder who has hands-on access to the computer, or who has been able to take control of it remotely. That threat is in a different category, and there's no easy way to defend against it.
The comment is long because the issue is complex. The key points are in sections 5, 6, and 10.
OS X now implements three layers of built-in protection specifically against malware, not counting runtime protections such as execute disable, sandboxing, system library randomization, and address space layout randomization that may also guard against other kinds of exploits.
2. All versions of OS X since 10.6.7 have been able to detect known Mac malware in downloaded files, and to block insecure web plugins. This feature is transparent to the user. Internally Apple calls it "XProtect."
The malware recognition database used by XProtect is automatically updated; however, you shouldn't rely on it, because the attackers are always at least a day ahead of the defenders.
The following caveats apply to XProtect:
☞ It can be bypassed by some third-party networking software, such as BitTorrent clients and Java applets.
☞ It only applies to software downloaded from the network. Software installed from a CD or other media is not checked.
As new versions of OS X are released, it's not clear whether Apple will indefinitely continue to maintain the XProtect database of older versions such as 10.6. The security of obsolete system versions may eventually be degraded. Security updates to the code of obsolete systems will stop being released at some point, and that may leave them open to other kinds of attack besides malware.
3. Starting with OS X 10.7.5, there has been a second layer of built-in malware protection, designated "Gatekeeper" by Apple. By default, applications and Installer packages downloaded from the network will only run if they're digitally signed by a developer with a certificate issued by Apple. Software certified in this way hasn't necessarily been tested by Apple, but you can be reasonably sure that it hasn't been modified by anyone other than the developer. His identity is known to Apple, so he could be held legally responsible if he distributed malware. That may not mean much if the developer lives in a country with a weak legal system (see below.)
Gatekeeper doesn't depend on a database of known malware. It has, however, the same limitations as XProtect, and in addition the following:
☞ It can easily be disabled or overridden by the user.
☞ A malware attacker could get control of a code-signing certificate under false pretenses, or could simply ignore the consequences of distributing codesigned malware.
☞ An App Store developer could find a way to bypass Apple's oversight, or the oversight could fail due to human error.
Apple has taken far too long to revoke the codesigning certificates of some known abusers, thereby diluting the value of Gatekeeper and the Developer ID program. Those lapses don't involve App Store products, however.
For the reasons given, App Store products, and—to a lesser extent—other applications recognized by Gatekeeper as signed, are safer than others, but they can't be considered absolutely safe. "Sandboxed" applications may prompt for access to private data, such as your contacts, or for access to the network. Think before granting that access. Sandbox security is based on user input. Never click through any request for authorization without thinking.
4. Starting with OS X 10.8.3, a third layer of protection has been added: a "Malware Removal Tool" (MRT). MRT runs automatically in the background when you update the OS. It checks for, and removes, malware that may have evaded the other protections via a Java exploit (see below.) MRT also runs when you install or update the Apple-supplied Java runtime (but not the Oracle runtime.) Like XProtect, MRT is effective against known threats, but not against unknown ones. It notifies you if it finds malware, but otherwise there's no user interface to MRT.
5. The built-in security features of OS X reduce the risk of malware attack, but they are not, and never will be, complete protection. Malware is a problem of human behavior, not machine behavior, and no technological fix alone is going to solve it. Trusting software to protect you will only make you more vulnerable.
The best defense is always going to be your own intelligence. With the possible exception of Java exploits, all known malware circulating on the Internet that affects a fully-updated installation of OS X 10.6 or later takes the form of so-called "Trojan horses," which can only have an effect if the victim is duped into running them. The threat therefore amounts to a battle of wits between you and Internet criminals. If you're better informed than they think you are, you'll win. That means, in practice, that you always stay within a safe harbor of computing practices. How do you know when you're leaving the safe harbor? Below are some warning signs of danger.
Software from an untrustworthy source
☞ Software with a corporate brand, such as Adobe Flash Player, doesn't come directly from the developer’s website. Do not trust an alert from any website to update Flash, or your browser, or any other software. A genuine alert that Flash is outdated and blocked is shown on this support page. Follow the instructions on the support page in that case. Otherwise, assume that the alert is fake and someone is trying to scam you into installing malware. If you see such alerts on more than one website, ask for instructions.
☞ Software of any kind is distributed via BitTorrent, or Usenet, or on a website that also distributes pirated music or movies.
☞ Rogue websites such as Softonic, Soft32, and CNET Download distribute free applications that have been packaged in a superfluous "installer."
☞ The software is advertised by means of spam or intrusive web ads. Any ad, on any site, that includes a direct link to a download should be ignored.
Software that is plainly illegal or does something illegal
☞ High-priced commercial software such as Photoshop is "cracked" or "free."
☞ An application helps you to infringe copyright, for instance by circumventing the copy protection on commercial software, or saving streamed media for reuse without permission. All "YouTube downloaders" are in this category, though not all are necessarily malicious.
Conditional or unsolicited offers from strangers
☞ A telephone caller or a web page tells you that you have a “virus” and offers to help you remove it. (Some reputable websites did legitimately warn visitors who were infected with the "DNSChanger" malware. That exception to this rule no longer applies.)
☞ A web site offers free content such as video or music, but to use it you must install a “codec,” “plug-in,” "player," "downloader," "extractor," or “certificate” that comes from that same site, or an unknown one.
☞ You win a prize in a contest you never entered.
☞ Someone on a message board such as this one is eager to help you, but only if you download an application of his choosing.
☞ A "FREE WI-FI !!!" network advertises itself in a public place such as an airport, but is not provided by the management.
☞ Anything online that you would expect to pay for is "free."
Unexpected events
☞ A file is downloaded automatically when you visit a web page, with no other action on your part. Delete any such file without opening it.
☞ You open what you think is a document and get an alert that it's "an application downloaded from the Internet." Click Cancel and delete the file. Even if you don't get the alert, you should still delete any file that isn't what you expected it to be.
☞ An application does something you don't expect, such as asking for permission to access your contacts, your location, or the Internet for no obvious reason.
☞ Software is attached to email that you didn't request, even if it comes (or seems to come) from someone you trust.
I don't say that leaving the safe harbor just once will necessarily result in disaster, but making a habit of it will weaken your defenses against malware attack. Any of the above scenarios should, at the very least, make you uncomfortable.
6. Java on the Web (not to be confused with JavaScript, to which it's not related, despite the similarity of the names) is a weak point in the security of any system. Java is, among other things, a platform for running complex applications in a web page, on the client. That was always a bad idea, and Java's developers have proven themselves incapable of implementing it without also creating a portal for malware to enter. Past Java exploits are the closest thing there has ever been to a Windows-style virus affecting OS X. Merely loading a page with malicious Java content could be harmful.
Fortunately, client-side Java on the Web is obsolete and mostly extinct. Only a few outmoded sites still use it. Try to hasten the process of extinction by avoiding those sites, if you have a choice. Forget about playing games or other non-essential uses of Java.
Java is not included in OS X 10.7 and later. Discrete Java installers are distributed by Apple and by Oracle (the developer of Java.) Don't use either one unless you need it. Most people don't. If Java is installed, disable it—not JavaScript—in your browsers.
Regardless of version, experience has shown that Java on the Web can't be trusted. If you must use a Java applet for a task on a specific site, enable Java only for that site in Safari. Never enable Java for a public website that carries third-party advertising. Use it only on well-known, login-protected, secure websites without ads. In Safari 6 or later, you'll see a padlock icon in the address bar when visiting a secure site.
Stay within the safe harbor, and you’ll be as safe from malware as you can practically be. The rest of this comment concerns what you should not do to protect yourself.
7. Never install any commercial "anti-virus" (AV) or "Internet security" products for the Mac, as they are all worse than useless. If you need to be able to detect Windows malware in your files, use one of the free security apps in the Mac App Store—nothing else.
Why shouldn't you use commercial AV products?
☞ To recognize malware, the software depends on a database of known threats, which is always at least a day out of date. This technique is a proven failure, as a major AV software vendor has admitted. Most attacks are "zero-day"—that is, previously unknown. Recognition-based AV does not defend against such attacks, and the enterprise IT industry is coming to the realization that traditional AV software is worthless.
☞ Its design is predicated on the nonexistent threat that malware may be injected at any time, anywhere in the file system. Malware is downloaded from the network; it doesn't materialize from nowhere. In order to meet that nonexistent threat, commercial AV software modifies or duplicates low-level functions of the operating system, which is a waste of resources and a common cause of instability, bugs, and poor performance.
☞ By modifying the operating system, the software may also create weaknesses that could be exploited by malware attackers.
☞ Most importantly, a false sense of security is dangerous.
8. An AV product from the App Store, such as "ClamXav," has the same drawback as the commercial suites of being always out of date, but it does not inject low-level code into the operating system. That doesn't mean it's entirely harmless. It may report email messages that have "phishing" links in the body, or Windows malware in attachments, as infected files, and offer to delete or move them. Doing so will corrupt the Mail database. The messages should be deleted from within the Mail application.
An AV app is not needed, and cannot be relied upon, for protection against OS X malware. It's useful, if at all, only for detecting Windows malware, and even for that use it's not really effective, because new Windows malware is emerging much faster than OS X malware.
Windows malware can't harm you directly (unless, of course, you use Windows.) Just don't pass it on to anyone else. A malicious attachment in email is usually easy to recognize by the name alone. An actual example:
London Terror Moovie.avi [124 spaces] Checked By Norton Antivirus.exe
You don't need software to tell you that's a Windows trojan. Software may be able to tell you which trojan it is, but who cares? In practice, there's no reason to use recognition software unless an organizational policy requires it. Windows malware is so widespread that you should assume it's in every email attachment until proven otherwise. Nevertheless, ClamXav or a similar product from the App Store may serve a purpose if it satisfies an ill-informed network administrator who says you must run some kind of AV application. It's free and it won't handicap the system.
The ClamXav developer won't try to "upsell" you to a paid version of the product. Other developers may do that. Don't be upsold. For one thing, you should not pay to protect Windows users from the consequences of their choice of computing platform. For another, a paid upgrade from a free app will probably have all the disadvantages mentioned in section 7.
9. It seems to be a common belief that the built-in Application Firewall acts as a barrier to infection, or prevents malware from functioning. It does neither. It blocks inbound connections to certain network services you're running, such as file sharing. It's disabled by default and you should leave it that way if you're behind a router on a private home or office network. Activate it only when you're on an untrusted network, for instance a public Wi-Fi hotspot, where you don't want to provide services. Disable any services you don't use in the Sharing preference pane. All are disabled by default.
10. As a Mac user, you don't have to live in fear that your computer may be infected every time you install software, read email, or visit a web page. But neither can you assume that you will always be safe from exploitation, no matter what you do. Navigating the Internet is like walking the streets of a big city. It can be as safe or as dangerous as you choose to make it. The greatest harm done by security software is precisely its selling point: it makes people feel safe. They may then feel safe enough to take risks from which the software doesn't protect them. Nothing can lessen the need for safe computing practices.

Should I exchange my freezing iMac?

Hi I just got my 24" iMac 2 days ago. Yesterday the iMac froze 3 times.. .twice within 5 mintues! and twice today already. Now I know Apple is aware of this issue but I am also aware this does not happen on every iMac, so should I send this back into Apple for an exchange? What did you do about your freezing iMac?

First of all I can't believe Apple is letting this go on as long as they have. People buying new computers and right out of the box having issues is unacceptable.
I bought the first computer a week after they were released and had no problems until the Software update 1.1 was released then as soon as I downloaded it I crashed and froze all time after that. After nearly two weeks of phone calls back and forth with Apple I was told it was a hardware problem and that they needed to swap out the graphics card.
To say the least I was a little mad seeing how this was a brand new computer so I fired off a angry email to Steve Jobs. The very next day I got a call from a woman saying she was from the Apple executive offices and they were very sorry about my troubles and they would replace the computer. The next night I brought the computer home I turned it on, downloaded the updates and an hour later it froze. So at that point I removed the update called Apple again and told them the issue. And then unbelievably they told me to put the update back on the computer. So once again like an idiot I did it and had the same problems.
After that I said enough, I erased and reinstalled did not put the 1.1 update on my new computer but I went out on the web and downloaded the 1.0 update put that back on and everything has been stable ( I did have one questionable crash in the last 21/2 weeks which does lead me to think there is some kind of hardware issue which hopefully will be solved with a newer update. Though I don't want to be the first one to try it.) Also two days after I did this Apple made their "small number of computers" announcement.
So to cut to the chase if you can get your computer stable (maybe by taking the 1.1 update off and putting 1.0 on. Though a lot of people are saying that is not working for them either) I would stick with what you have. If not I would not put up with constant freezing.
I'm not buying the whole "small numbers" thing myself but thats just my opinion.

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Here are some general tips to keep your Mac's hard drive trim and slim as possible
You should never, EVER let a conputer hard drive get completely full, EVER!
With Macs and OS X, you shouldn't let the hard drive get below 15 GBs or less of free data space.
If it does, it's time for some hard drive housecleaning.
Follow some of my tips for cleaning out, deleting and archiving data from your Mac's internal hard drive.
Have you emptied your Mac's Trash icon in the Dock?
If you use iPhoto, iPhoto has its own trash that needs to be emptied, also.
If you store images in other locations other than iPhoto, then you will have to weed through these to determine what to archive and what to delete.
If you use Apple Mail app, Apple Mail also has its own trash area that needs to be emptied, too!
Delete any old or no longer needed emails and/or archive to disc, flash drives or external hard drive, older emails you want to save.
Look through your other Mailboxes and other Mail categories to see If there is other mail you can archive and/or delete.
STAY AWAY FROM DELETING ANY FILES FROM OS X SYSTEM FOLDER!
Look through your Documents folder and delete any type of old useless type files like "Read Me" type files.
Again, archive to disc, flash drives, ext. hard drives or delete any old documents you no longer use or immediately need.
Look in your Applications folder, if you have applications you haven't used in a long time, if the app doesn't have a dedicated uninstaller, then you can simply drag it into the OS X Trash icon. IF the application has an uninstaller app, then use it to completely delete the app from your Mac.
To find other large files, download an app called Omni Disk Sweeper.
Download an app called OnyX for your version of OS X.
When you install and launch it, let it do its initial automatic tests, then go to the cleaning and maintenance tabs and run the maintenance tabs that let OnyX clean out all web browser cache files, web browser histories, system cache files, delete old error log files.
Typically, iTunes and iPhoto libraries are the biggest users of HD space.
move these files/data off of your internal drive to the external hard drive and deleted off of the internal hard drive.
If you have any other large folders of personal data or projects, these should be archived or moved, also, to the optical discs, flash drives or external hard drive and then either archived to disc and/or deleted off your internal hard drive.
Good Luck!

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Guy would this be of any help:
To start up your computer in Apple Hardware Test:
Press the power button to turn on your computer.
Press and hold the D key before the gray startup screen appears. If Apple Hardware Test does not start up, see the Additional Information section at the end of this article.
Note: Some Macintosh computers that shipped with OS X Lion support the use of Apple Hardware Test over the Internet. These computers will start up to an Internet-based version of AHT if the hard drive does not contain AHT. An Internet-enabled connection via Ethernet or Wi-Fi is required to use this feature.
It takes a minute or so for Apple Hardware Test to start up and inspect your hardware configuration. While this is taking place, an icon appears on the screen:
When the process is complete, select your language and click the right arrow. If you aren't using a mouse, you can use the up and down arrows to select a language and then press the Return key.
The Apple Hardware Test console appears. You can choose which sort of test or tests to perform:
To perform all of the basic tests, click the Test button or press the "T" key or the Return key.
To perform a more thorough diagnostic test, select the "Perform extended testing" checkbox under the Test button before you click the Test button.
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Solved freezing iMac

I thought I would post a separate thread as my experience may get lost in all the other threads about freezing iMacs.
I too like a lot of other people here suffered (sorry to those still suffering) my iMac freezing. It was not tied down to doing anything in particular it just did it when it liked.
After 3 phone calls to apple support and being refered to the higher level of support twice I told apple support that with all due respect I am going round in circles talking to you and will be taking it to the apple store in Birmingham.
Believe it or not but it didn't freeze once in the apple store, I asked the genius after he had spent half an hour on it that if it freezes again it has to be hardware. He confirmed this (not too loudly I may add).
On getting back home the first thing it did was freeze. I phoned up apple care again (no. 4) and basically said to them in no uncertain terms that they will repair or replace it. After trying to fob me off to the higher level of support again, they came back and informed me that there was a footnote on my file that said send it straight for repair.
Well after 3 weeks (busy local repair centre) I received my iMac in full working order; repair diagnosis - new graphics card. It has now been a week and it has operated flawlessly.
To those of you still having problems I would suggest that you ignore emailing them as I have still yet to receive a reply. But just keep phoning them and eventually you will get you just deserves.
Sorry to make you sit and read this but I just wanted to tell my story.
Now, a very happy iMac user and fully updated.

Hi bud ive just posted a thread about just taking delivery of a new imac..
When did you get yours fixed.. and could it be.. that my imac may have the same or a newer batch of graphics cards that may fix it?
I will be seriously urinated off if i have to send back a brand new £1500 computer.. like all of us i guess!!
I knew i shouldnt of googled new aluminium imac problems.
On another note i've also got an oldschool g4 emac arriving (strange ebay deal..!) so who knows where my next reply could be from, it arrives a week today

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