Imac G5 Shuts down at start up?

I have an imac G5 running 10.4 that shuts down during the start up process. It gets to the grey apple screen and the spinning wheel and then just shuts down. I have tried the original start up disk and the same thing happens. I have tried Holding C and nothing, and I have tried just the option key. I have already tried to load it in safe mode and no luck. I have even done the command-v as well. I am at a lost and wonder if the problem is even worth fixing if I take it to get repaired.

jsandberg wrote:
I have an imac G5 running 10.4 that shuts down during the start up process. It gets to the grey apple screen and the spinning wheel and then just shuts down. I have tried the original start up disk and the same thing happens. I have tried Holding C and nothing, and I have tried just the option key. I have already tried to load it in safe mode and no luck. I have even done the command-v as well. I am at a lost and wonder if the problem is even worth fixing if I take it to get repaired.
Only you can answer that one. You have already tried all the usual troubleshooting solutions. Take the comp in for repairs and get an estimate. If you feel the price is worth it....................................
If you do get the computer repaired, it will be to your best interest to update your OS to 10.4.1. Use Software Update to update your OS to the last version of Tiger. Install all the other updates that goes along w/it.
Which G5 model/generation do you have? See KB Articles: http://docs.info.apple.com/article.html?artnum=301724-en How to identify your iMac and http://docs.info.apple.com/article.html?artnum=300205 iMac G5 DIY (Do-It-Yourself) Instructions

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7/22/09 10:39:01 AM com.apple.launchctl.System[2] launchctl: Please convert the following to launchd: /etc/mach_init.d/dashboardadvisoryd.plist
7/22/09 10:39:01 AM com.apple.launchd[1] (com.apple.blued) Unknown key for boolean: EnableTransactions
7/22/09 10:39:01 AM com.apple.launchd[1] (com.apple.usbmuxd) Unknown key for boolean: EnableTransactions
7/22/09 10:39:01 AM com.apple.launchd[1] (org.cups.cups-lpd) Unknown key: SHAuthorizationRight
7/22/09 10:39:01 AM com.apple.launchd[1] (org.cups.cupsd) Unknown key: SHAuthorizationRight
7/22/09 10:39:01 AM com.apple.launchd[1] (org.ntp.ntpd) Unknown key: SHAuthorizationRight
7/22/09 10:39:01 AM com.apple.launchd[1] (org.x.privileged_startx) Unknown key for boolean: EnableTransactions
7/22/09 10:39:07 AM org.ntp.ntpd[27] Error : nodename nor servname provided, or not known
7/22/09 10:39:14 AM com.apple.launchd[1] (com.apple.aslmanager) Throttling respawn: Will start in 3 seconds
7/22/09 10:39:14 AM com.apple.launchd[1] (com.apple.UserEventAgent-LoginWindow[74]) Exited: Terminated
7/22/09 10:39:14 AM com.apple.launchd[1] (com.apple.ScreenSharing.server[73]) Exited: Terminated
7/22/09 10:39:15 AM com.apple.launchd[81] (com.apple.AirPortBaseStationAgent) Unknown key for boolean: EnableTransactions
7/22/09 10:39:15 AM com.apple.launchd[81] (org.x.startx) Unknown key for boolean: EnableTransactions
7/22/09 10:39:15 AM Dock[95] _DESCRegisterDockExtraClient failed 268435459
7/22/09 10:39:16 AM com.apple.launchd[81] ([email protected][85]) Exited with exit code: 1
7/22/09 10:39:17 AM [0x0-0xf00f].SoftwareUpdateCheck[104] SoftwareUpdateCheck: network unreachable
7/22/09 10:39:17 AM com.apple.launchd[81] ([0x0-0xf00f].SoftwareUpdateCheck[104]) Exited with exit code: 3
7/22/09 10:40:55 AM com.apple.loginwindow[36] Shutdown NOW!
7/22/09 10:40:55 AM com.apple.loginwindow[36] System shutdown time has arrived
7/22/09 10:41:29 AM com.apple.launchctl.System[2] launchctl: Please convert the following to launchd: /etc/mach_init.d/dashboardadvisoryd.plist
7/22/09 10:41:29 AM com.apple.launchd[1] (com.apple.blued) Unknown key for boolean: EnableTransactions
7/22/09 10:41:29 AM com.apple.launchd[1] (com.apple.usbmuxd) Unknown key for boolean: EnableTransactions
7/22/09 10:41:29 AM com.apple.launchd[1] (org.cups.cups-lpd) Unknown key: SHAuthorizationRight
7/22/09 10:41:29 AM com.apple.launchd[1] (org.cups.cupsd) Unknown key: SHAuthorizationRight
7/22/09 10:41:29 AM com.apple.launchd[1] (org.ntp.ntpd) Unknown key: SHAuthorizationRight
7/22/09 10:41:29 AM com.apple.launchd[1] (org.x.privileged_startx) Unknown key for boolean: EnableTransactions
7/22/09 10:41:35 AM org.ntp.ntpd[27] Error : nodename nor servname provided, or not known
7/22/09 10:41:39 AM com.apple.launchd[1] (com.apple.UserEventAgent-LoginWindow[80]) Exited: Terminated
7/22/09 10:41:39 AM com.apple.launchd[1] (com.apple.ScreenSharing.server[79]) Exited: Terminated
7/22/09 10:41:39 AM com.apple.launchd[86] (com.apple.AirPortBaseStationAgent) Unknown key for boolean: EnableTransactions
7/22/09 10:41:39 AM com.apple.launchd[86] (org.x.startx) Unknown key for boolean: EnableTransactions
7/22/09 10:41:42 AM com.apple.launchd[86] ([email protected][90]) Exited with exit code: 1
7/22/09 10:42:06 AM com.apple.loginwindow[36] Shutdown NOW!
7/22/09 10:42:06 AM com.apple.loginwindow[36] System shutdown time has arrived
7/22/09 8:39:44 PM com.apple.launchctl.System[2] launchctl: Please convert the following to launchd: /etc/mach_init.d/dashboardadvisoryd.plist
7/22/09 8:39:44 PM com.apple.launchd[1] (com.apple.blued) Unknown key for boolean: EnableTransactions
7/22/09 8:39:44 PM com.apple.launchd[1] (com.apple.usbmuxd) Unknown key for boolean: EnableTransactions
7/22/09 8:39:44 PM com.apple.launchd[1] (org.cups.cups-lpd) Unknown key: SHAuthorizationRight
7/22/09 8:39:44 PM com.apple.launchd[1] (org.cups.cupsd) Unknown key: SHAuthorizationRight
7/22/09 8:39:44 PM com.apple.launchd[1] (org.ntp.ntpd) Unknown key: SHAuthorizationRight
7/22/09 8:39:44 PM com.apple.launchd[1] (org.x.privileged_startx) Unknown key for boolean: EnableTransactions
7/22/09 8:39:50 PM org.ntp.ntpd[27] Error : nodename nor servname provided, or not known
7/22/09 8:39:54 PM com.apple.launchd[1] (com.apple.UserEventAgent-LoginWindow[74]) Exited: Terminated
7/22/09 8:39:54 PM com.apple.launchd[1] (com.apple.ScreenSharing.server[73]) Exited: Terminated
7/22/09 8:39:56 PM com.apple.launchd[81] (com.apple.AirPortBaseStationAgent) Unknown key for boolean: EnableTransactions
7/22/09 8:39:56 PM com.apple.launchd[81] (org.x.startx) Unknown key for boolean: EnableTransactions
7/22/09 8:40:00 PM Dock[98] _DESCRegisterDockExtraClient failed 268435459
7/22/09 8:40:01 PM com.apple.launchd[81] ([email protected][85]) Exited with exit code: 1
7/22/09 8:51:04 PM iDVD[117] Warning once: This application, or a library it uses, is using NSQuickDrawView, which has been deprecated. Apps should cease use of QuickDraw and move to Quartz.
7/22/09 8:51:05 PM com.apple.loginwindow[36] Shutdown NOW!
7/22/09 8:51:05 PM com.apple.loginwindow[36] System shutdown time has arrived
7/22/09 9:18:06 PM com.apple.launchctl.System[2] launchctl: Please convert the following to launchd: /etc/mach_init.d/dashboardadvisoryd.plist
7/22/09 9:18:06 PM com.apple.launchd[1] (com.apple.blued) Unknown key for boolean: EnableTransactions
7/22/09 9:18:06 PM com.apple.launchd[1] (com.apple.usbmuxd) Unknown key for boolean: EnableTransactions
7/22/09 9:18:06 PM com.apple.launchd[1] (org.cups.cups-lpd) Unknown key: SHAuthorizationRight
7/22/09 9:18:06 PM com.apple.launchd[1] (org.cups.cupsd) Unknown key: SHAuthorizationRight
7/22/09 9:18:06 PM com.apple.launchd[1] (org.ntp.ntpd) Unknown key: SHAuthorizationRight
7/22/09 9:18:06 PM com.apple.launchd[1] (org.x.privileged_startx) Unknown key for boolean: EnableTransactions
7/22/09 9:18:17 PM org.ntp.ntpd[27] Error : nodename nor servname provided, or not known
7/22/09 9:18:20 PM com.apple.launchd[1] (com.apple.UserEventAgent-LoginWindow[74]) Exited: Terminated
7/22/09 9:18:20 PM com.apple.launchd[1] (com.apple.ScreenSharing.server[73]) Exited: Terminated
7/22/09 9:18:21 PM com.apple.launchd[83] (com.apple.AirPortBaseStationAgent) Unknown key for boolean: EnableTransactions
7/22/09 9:18:21 PM com.apple.launchd[83] (org.x.startx) Unknown key for boolean: EnableTransactions
7/22/09 9:18:24 PM com.apple.launchd[83] ([email protected][87]) Exited with exit code: 1
7/22/09 9:30:03 PM iDVD[135] Warning once: This application, or a library it uses, is using NSQuickDrawView, which has been deprecated. Apps should cease use of QuickDraw and move to Quartz.
7/22/09 9:54:14 PM com.apple.launchd[83] (com.apple.Spotlight[93]) Exited abnormally: Segmentation fault
7/22/09 10:00:26 PM iDVD[228] Warning once: This application, or a library it uses, is using NSQuickDrawView, which has been deprecated. Apps should cease use of QuickDraw and move to Quartz.
7/23/09 10:53:01 AM com.apple.launchctl.System[2] launchctl: Please convert the following to launchd: /etc/mach_init.d/dashboardadvisoryd.plist
7/23/09 10:53:01 AM com.apple.launchd[1] (com.apple.blued) Unknown key for boolean: EnableTransactions
7/23/09 10:53:01 AM com.apple.launchd[1] (com.apple.usbmuxd) Unknown key for boolean: EnableTransactions
7/23/09 10:53:01 AM com.apple.launchd[1] (org.cups.cups-lpd) Unknown key: SHAuthorizationRight
7/23/09 10:53:01 AM com.apple.launchd[1] (org.cups.cupsd) Unknown key: SHAuthorizationRight
7/23/09 10:53:01 AM com.apple.launchd[1] (org.ntp.ntpd) Unknown key: SHAuthorizationRight
7/23/09 10:53:01 AM com.apple.launchd[1] (org.x.privileged_startx) Unknown key for boolean: EnableTransactions
7/23/09 10:53:14 AM com.apple.launchd[1] (com.apple.aslmanager) Throttling respawn: Will start in 9 seconds
7/23/09 10:53:14 AM com.apple.launchd[1] (com.apple.aslmanager) Throttling respawn: Will start in 9 seconds
7/23/09 10:53:14 AM com.apple.launchd[1] (com.apple.aslmanager) Throttling respawn: Will start in 9 seconds
7/23/09 10:53:16 AM com.apple.launchd[1] (com.apple.UserEventAgent-LoginWindow[74]) Exited: Terminated
7/23/09 10:53:16 AM com.apple.launchd[1] (com.apple.ScreenSharing.server[73]) Exited: Terminated
7/23/09 10:53:16 AM com.apple.launchd[80] (com.apple.AirPortBaseStationAgent) Unknown key for boolean: EnableTransactions
7/23/09 10:53:16 AM com.apple.launchd[80] (org.x.startx) Unknown key for boolean: EnableTransactions
7/23/09 10:53:17 AM com.apple.launchd[80] ([email protected][84]) Exited with exit code: 1
7/23/09 10:55:26 AM com.apple.launchctl.System[2] fsck_hfs: Volume is journaled. No checking performed.
7/23/09 10:55:26 AM com.apple.launchctl.System[2] fsck_hfs: Use the -f option to force checking.
7/23/09 10:55:29 AM com.apple.launchctl.System[2] launchctl: Please convert the following to launchd: /etc/mach_init.d/dashboardadvisoryd.plist
7/23/09 10:55:29 AM com.apple.launchd[1] (com.apple.blued) Unknown key for boolean: EnableTransactions
7/23/09 10:55:29 AM com.apple.launchd[1] (com.apple.usbmuxd) Unknown key for boolean: EnableTransactions
7/23/09 10:55:29 AM com.apple.launchd[1] (org.cups.cups-lpd) Unknown key: SHAuthorizationRight
7/23/09 10:55:29 AM com.apple.launchd[1] (org.cups.cupsd) Unknown key: SHAuthorizationRight
7/23/09 10:55:29 AM com.apple.launchd[1] (org.ntp.ntpd) Unknown key: SHAuthorizationRight
7/23/09 10:55:29 AM com.apple.launchd[1] (org.x.privileged_startx) Unknown key for boolean: EnableTransactions
7/23/09 10:55:39 AM com.apple.launchd[1] (com.apple.UserEventAgent-LoginWindow[72]) Exited: Terminated
7/23/09 10:55:39 AM com.apple.launchd[1] (com.apple.ScreenSharing.server[71]) Exited: Terminated
7/23/09 10:55:41 AM com.apple.launchd[81] (com.apple.AirPortBaseStationAgent) Unknown key for boolean: EnableTransactions
7/23/09 10:55:41 AM com.apple.launchd[81] (org.x.startx) Unknown key for boolean: EnableTransactions
7/23/09 10:55:50 AM com.apple.launchd[81] ([email protected][85]) Exited with exit code: 1
7/23/09 11:17:51 AM com.apple.launchctl.System[2] fsck_hfs: Volume is journaled. No checking performed.
7/23/09 11:17:51 AM com.apple.launchctl.System[2] fsck_hfs: Use the -f option to force checking.
7/23/09 11:17:54 AM com.apple.launchctl.System[2] launchctl: Please convert the following to launchd: /etc/mach_init.d/dashboardadvisoryd.plist
7/23/09 11:17:54 AM com.apple.launchd[1] (com.apple.blued) Unknown key for boolean: EnableTransactions
7/23/09 11:17:54 AM com.apple.launchd[1] (com.apple.usbmuxd) Unknown key for boolean: EnableTransactions
7/23/09 11:17:54 AM com.apple.launchd[1] (org.cups.cups-lpd) Unknown key: SHAuthorizationRight
7/23/09 11:17:54 AM com.apple.launchd[1] (org.cups.cupsd) Unknown key: SHAuthorizationRight
7/23/09 11:17:54 AM com.apple.launchd[1] (org.ntp.ntpd) Unknown key: SHAuthorizationRight
7/23/09 11:17:54 AM com.apple.launchd[1] (org.x.privileged_startx) Unknown key for boolean: EnableTransactions
7/23/09 11:18:10 AM com.apple.launchd[1] (com.apple.UserEventAgent-LoginWindow[75]) Exited: Terminated
7/23/09 11:18:10 AM com.apple.launchd[1] (com.apple.ScreenSharing.server[74]) Exited: Terminated
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7/23/09 11:18:10 AM com.apple.launchd[82] (org.x.startx) Unknown key for boolean: EnableTransactions
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7/23/09 11:19:23 AM [0x0-0x12012].com.apple.Safari[115] Debugger() was called!
7/23/09 11:55:06 AM com.apple.launchctl.System[2] fsck_hfs: Volume is journaled. No checking performed.
7/23/09 11:55:06 AM com.apple.launchctl.System[2] fsck_hfs: Use the -f option to force checking.
7/23/09 11:55:08 AM com.apple.launchctl.System[2] launchctl: Please convert the following to launchd: /etc/mach_init.d/dashboardadvisoryd.plist
7/23/09 11:55:08 AM com.apple.launchd[1] (com.apple.blued) Unknown key for boolean: EnableTransactions
7/23/09 11:55:08 AM com.apple.launchd[1] (com.apple.usbmuxd) Unknown key for boolean: EnableTransactions
7/23/09 11:55:08 AM com.apple.launchd[1] (org.cups.cups-lpd) Unknown key: SHAuthorizationRight
7/23/09 11:55:08 AM com.apple.launchd[1] (org.cups.cupsd) Unknown key: SHAuthorizationRight
7/23/09 11:55:08 AM com.apple.launchd[1] (org.ntp.ntpd) Unknown key: SHAuthorizationRight
7/23/09 11:55:08 AM com.apple.launchd[1] (org.x.privileged_startx) Unknown key for boolean: EnableTransactions
7/23/09 11:55:25 AM com.apple.launchd[1] (com.apple.UserEventAgent-LoginWindow[76]) Exited: Terminated
7/23/09 11:55:25 AM com.apple.launchd[1] (com.apple.ScreenSharing.server[75]) Exited: Terminated
7/23/09 11:55:25 AM com.apple.launchd[82] (com.apple.AirPortBaseStationAgent) Unknown key for boolean: EnableTransactions
7/23/09 11:55:25 AM com.apple.launchd[82] (org.x.startx) Unknown key for boolean: EnableTransactions
7/23/09 11:55:25 AM com.apple.launchd[82] ([email protected][86]) Exited with exit code: 1
7/23/09 12:02:59 PM iMac EFI Firmware Update[140] TMPDIR is set to '/var/folders/GC/GCWw-4RiGJSH3cFjActCtE+TI/-Tmp-/', unsetting it.
7/23/09 12:02:59 PM iMac EFI Firmware Update[140] iMac EFI Firmware Update version 1.4
7/23/09 12:02:59 PM iMac EFI Firmware Update[140] OS version is 10.5.7 build 9J61.
7/23/09 12:02:59 PM iMac EFI Firmware Update[140] No AppleEFINVRAM
7/23/09 12:03:01 PM [0x0-0x19019].com.apple.updaters.imac.efifirmwareupdater14[140] Run the executable in the Contents/MacOS folder with '-h' option to learn about running remotely.

most likely caused by overheating due to video encoding increasing cpu usage (system freezing and shutdowns is a problem with older intel imacs). monitor your internal temps using an app like istat. temporary workaround is to use an fan control app like imacfancontrol and increase the cpu fan speeds. but this does not actually fix the problem which may arise more periodically as the system gets older.
http://www.islayer.com/apps/istatpro/
http://www.derman.com/Download/Special/iMacFanControl.html
there's a very long thread regarding this problem:
http://discussions.apple.com/thread.jspa?threadID=1467276&tstart=0

Since installing OSX 10 my iMac randomly shuts down and restarts. I can not determine why this is happening. Any ideas?

Since installing OSX 10, my iMac randomly shuts down and restarts. I can not determine why this is happening. Any ideas?

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. 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 victim's computer. That threat is in a different category, and there's no easy way to defend against it. If you have reason to suspect that you're the target of such an attack, you need expert help.
If you find this comment too long or too technical, read only 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, but internally Apple calls it "XProtect." The malware recognition database is automatically checked for updates once a day; 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.
For the reasons given above, App Store products, and 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. Sandboxing 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're not absolute protection. The first and best line of 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 the malware attacker. If you're smarter than he thinks you are, you'll win.
That means, in practice, that you always stay within a safe harbor of computing practices. How do you know what is safe?
Any website that prompts you to install a “codec,” “plug-in,” "player," "extractor," or “certificate” that comes from that same site, or an unknown one, is unsafe.
A web operator who tells you that you have a “virus,” or that anything else is wrong with your computer, or that you have won a prize in a contest you never entered, is trying to commit a crime with you as the victim. (Some reputable websites did legitimately warn visitors who were infected with the "DNSChanger" malware. That exception to this rule no longer applies.)
Pirated copies or "cracks" of commercial software, no matter where they come from, are unsafe.
Software of any kind downloaded from a BitTorrent or from a Usenet binary newsgroup is unsafe.
Software that purports to help you do something that's illegal or that infringes copyright, such as saving streamed audio or video for reuse without permission, is unsafe. All YouTube "downloaders" are outside the safe harbor, though not all are necessarily harmful.
Software with a corporate brand, such as Adobe Flash Player, must be downloaded directly from the developer’s website. If it comes from any other source, it's unsafe. For instance, if a web page warns you that Flash is out of date, do not follow an offered link to an update. Go to the Adobe website to download it, if you need it at all.
Even signed applications, no matter what the source, should not be trusted if they do something unexpected, such as asking for permission to access your contacts, your location, or the Internet for no obvious reason.
"FREE WI-FI !!!" networks in public places are unsafe unless you can verify that the network is not a trap (which you probably can't.) Even then, do not download any software or transmit any private information while connected to such a network, regardless of where it seems to come from or go to.
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 lock icon in the address bar with the abbreviation "https" when visiting a secure site.
Follow the above guidelines, 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" or "Internet security" products for the Mac, as they all do more harm than good, if they do any good at all. Any database of known threats is always going to be out of date. Most of the danger is from unknown threats. If you need to be able to detect Windows malware in your files, use one of the free anti-virus products in the Mac App Store — nothing else.
Why shouldn't you use commercial "anti-virus" products?
Their 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, the 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.
To recognize malware, the software depends on a database of known threats, which is always at least a day out of date. Most of the real danger comes from highly targeted "zero-day" attacks that are not yet recognized.
By modifying the operating system, the software itself may create weaknesses that could be exploited by malware attackers.
8. An anti-malware product from the App Store, such as "ClamXav," doesn't have these drawbacks. That doesn't mean it's entirely safe. 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 anti-virus app is not needed, and should not be relied upon, for protection against OS X malware. It's useful only for detecting Windows malware. Windows malware can't harm you directly (unless, of course, you use Windows.) Just don't pass it on to anyone else.
A Windows malware attachment in email is usually easy to recognize. The file name will often be targeted at people who aren't very bright; for example:
♥♥♥♥♥♥♥♥♥♥♥♥♥♥!!!!!!!H0TBABEZ4U!!!!!!!.AVI♥♥♥♥♥♥♥♥♥♥♥♥♥♥.exe
Anti-virus software may be able to tell you which particular trojan it is, but do you care? In practice, there's seldom a reason to use the software unless an institutional policy requires it.
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 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 should you assume that you will always be safe from exploitation, no matter what you do. 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.

IMac is shutting down when it attempts to sleep with 'hibernate image' error

Our iMac is shutting down when it attempts to sleep. This started following a Yosemite security update, though of course it is difficult to determine for sure that that was the cause.
In the console, the following message occurs before every shut down:
kernel[0]: Failed to get hibernate image filename
Suggestions? Does someone perhaps know what exactly the hibernate image is (we have a tiled screensaver that shows an iPhoto album -- could it be that one of those files is corrupt?) so that I can attempt to change it to see if that fixes the problem?
Thanks!
System: iMac (21.5-inch, Mid 2011), OS X 10.10.2
Already tried:
I reset the SMC by following Apple's instructions for this computer (turn off, unplug, wait, replug, wait, turn on)

More information:
1. It looks like the crash/shut down is happening when the display tries to sleep (timing is 15 min after the beginning of automatic sleep).
2. When sleep is first initiated, I am seeing this in the console (not normal?):
2015-03-25 9:22:05.987 AM ScreenSaverEngine[485]: Preflight for plugin com.apple.ILPhotosPlugin failed, so it will not load. Error Domain=NSCocoaErrorDomain Code=3587 "The bundle “iLMBPhotosPlugin” couldn’t be loaded because it is damaged or missing necessary resources." (dlopen_preflight(/Library/Application Support/iLifeMediaBrowser/Plug-Ins/iLMBPhotosPlugin.ilmbplugin/Contents/MacOS/i LMBPhotosPlugin): Library not loaded: /System/Library/PrivateFrameworks/PhotoLibraryPrivate.framework/Versions/A/Phot oLibraryPrivate
Referenced from: /Library/Application Support/iLifeMediaBrowser/Plug-Ins/iLMBPhotosPlugin.ilmbplugin/Contents/MacOS/i LMBPhotosPlugin
Reason: image not found) UserInfo=0x7fed83841320 {NSLocalizedFailureReason=The bundle is damaged or missing necessary resources., NSLocalizedRecoverySuggestion=Try reinstalling the bundle., NSFilePath=/Library/Application Support/iLifeMediaBrowser/Plug-Ins/iLMBPhotosPlugin.ilmbplugin/Contents/MacOS/i LMBPhotosPlugin, NSDebugDescription=dlopen_preflight(/Library/Application Support/iLifeMediaBrowser/Plug-Ins/iLMBPhotosPlugin.ilmbplugin/Contents/MacOS/i LMBPhotosPlugin): Library not loaded: /System/Library/PrivateFrameworks/PhotoLibraryPrivate.framework/Versions/A/Phot oLibraryPrivate
Referenced from: /Library/Application Support/iLifeMediaBrowser/Plug-Ins/iLMBPhotosPlugin.ilmbplugin/Contents/MacOS/i LMBPhotosPlugin
Reason: image not found, NSBundlePath=/Library/Application Support/iLifeMediaBrowser/Plug-Ins/iLMBPhotosPlugin.ilmbplugin, NSLocalizedDescription=The bundle “iLMBPhotosPlugin” couldn’t be loaded because it is damaged or missing necessary resources.}
The iLMBPhotosPlugin file does exist:
ls -al "/Library/Application Support/iLifeMediaBrowser/Plug-Ins/iLMBPhotosPlugin.ilmbplugin/Contents/MacOS/"
total 80
drwxr-xr-x 3 root wheel 102 30 Jan 07:46 .
drwxr-xr-x 7 root wheel 238 30 Jan 07:46 ..
-rwxr-xr-x 1 root wheel 99840 29 Sep 01:41 iLMBPhotosPlugin
The Library PhotoLibraryPrivate.framework/Versions/A/PhotoLibraryPrivate does not (there is no directory called /System/Library/PrivateFrameworks/PhotoLibraryPrivate.framework)
sudo ls -ald "/System/Library/PrivateFrameworks/Photo"*
drwxr-xr-x 3 root wheel 102 11 Sep 2014 /System/Library/PrivateFrameworks/PhotoLibrary.framework

IMacs suddenly shuts down

Hi,
Since a while my iMac suddenly shuts down and reboots.
It starts with a frame freeze, can't move the mouse cursor. After a few seconds my iMac shuts down.
I have no idea what the problem can be.
This is the report of Console when it shuts down.

Hey MagicMarcus,
Thanks for the question. I understand that you are experiencing issues with your iMac unexpectedly shutting down or restarting. The following resource provides some great information if this happens, along with potential resolution steps if it is a reoccurring issue:
OS X: When your computer spontaneously restarts or displays "Your computer restarted because of a problem." - Apple Support
http://support.apple.com/en-us/HT200553
Thanks,
Matt M.

Does shutting down and starting up wear out the hard drive faster?

does anyone know if shutting down and starting up the imac repeatedly wear out the hard drive faster? I had heard that repeated shutting down and starting up of the hard drive will wear out the hard drive faster. If this is true, is it better to put the imac to sleep and shut down only when you absolutely have to or when you will be gone for a while? (e.g., going on vacation or when moving the imac). The imac manual suggests that if you are going to use the imac within a few days to put it to sleep and shut it down if you are not going to use it for a few days. Is this advice just to save you time since you don't have to reboot or will this help prolong the life of the hard drive? Of course, keeping the imac on all the time might waste energy (not sure if sleep mode saves energy). But since I use the imac practically everyday it may make sense to put it to sleep, especially if this will prolong the life of the hard drive. thanks

Good Morning,
In my experience there shouldn't be any unnecessary wear and tear on your hard drive from shutting down your computer unless you are doing an EXTREME amount of startup/shutdown cycles.
The average user should not put enough strain on the drive to even be noticed from normal startup/shutdown cycles.
Hope this helps! 
David

Since I installed Mountain Lion, my iMac has shut down after 15-20 minutes. I have adjusted screen saver, shut down time, and sleep after. Nothing seems to help, any ideas?

Since I installed Mountain Lion, my iMac has shut down after 15-20 minutes. I have adjusted screen saver, shut down time, and sleep after. Nothing seems to help, any ideas?

As old as your iMac is, have you cleaned out the dust? Dust buildup can lead to over heating issues. Remove any and all things plugged into it including the power cord, Remove the RAM access grille. Vacuum all openings starting with the RAM access area (air intake). Vacuum all ports and plugs, DVD slot and the opening across the top of the rear of the body. Blow compressed air through all your openings and vacuum again to remove any dust you loosend. Reinstall the RAM grille. Plug in the keyboard and mouse if not blue tooth. Insert power cord...
You are now in a perfect position to do a
SMC RESET
http://support.apple.com/kb/HT3964
Shut down the computer.
Unplug the computer's power cord and ALL peripherals.
Wait 15 seconds.
Attach the computers power cable.
Wait another 5 seconds and press the power button to turn on the computer.
It is the 5 second timing that initiates the reset.
Here is a link to a Widget to monitor your temps and other operations:
http://islayer.com/apps/istatpro/

Imac G5 Shuts down at start up?

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