Repeat for each DIMM in succession until you find the culprit. Once the screen turns grey the hardware tests are complete, and the Mac looks for a boot volume. Software now dominates the startup process. This can indicate a corrupt installation of Mac OS X or a failed or failing hard drive. Once the spinning gear appears the BSD kernel Darwin has assumed command and begins loading device drivers.
Such are the workings of UNIX. What this means for us mortals is that when a Mac stalls at the Apple logo or the logo with a spinning gear, it probably has a corrupt Mac OS X installation.
SOLVED: Power Mac G5 won't start - Power Mac G5 - iFixit
It may also be having trouble accessing an internal or external hardware component, but this is less-likely. DiskWarrior is also worth a shot this is by far my most used disk utility. A hang at a blue screen, at the login window, or at the image of your blank desktop often indicates a Problem with a User Account. Corrupt Fonts or bad Preference Files. Setting up a second, emergency admin account on your Mac is helpful for troubleshooting account problems. Safe Boot may help too, as that bypasses non-essential fonts and user startup items which you can then remove from your User Library folder.
Presented in your native language, or something close. Mac crashes can take on all sorts of appearances — the Spinning Beach Ball being perhaps the most familiar — but Apple has succeeded in scaring the bejesus out of many users with this dialog. It is accompanied by the screen slowly darkening from top to bottom before a multilingual warning appears:. A kernel panic can happen at virtually any point in the boot process and may indicate a corrupt OS, an incompatible kernel extension, or a hardware problem. Try a Safe Boot to disable non-Apple extensions. Intel Macs can also boot from a USB flash drive which contains a bootable disk image, this can be very handy in an emergency.
You can also use a clone of your Mac hard drive to boot a cantankerous system. This not only allows you to check, fix or copy data off the primary boot drive but continue working immediately when you have disk problems. Kacey — sounds like you have a bad hard drive. To follow up, just heard from the repair shop. The cable is bad.
Logic board is fine. Thanks for your guidance. You also may have a hairline fracture on the logic board or loose connector on cable. No problems until Sunday morning. I was able to log in and clicked on Mail icon. It froze. I did a force quit. Same thing happened when I launched Safari. I was in for about a minute and then it froze. I let the logo and spin gear go for about 3 hours and nothing. I tried booting from the install DVD and no luck either. Took it to a third party repair store and he was able to mount my old drive externally and I was able to get in.
He said either the cable from the HDD to the logic board was bad or the logic board was bad. Does this sound accurate? If the logic board truly was bad, would I be able to do anything whether the drive was mounted interal or externally? It is a little over a year old and I do not have a valid warranty. This issue happened after I shut off the computer by holding the start button due to safari having a rainbow pinwheel for a few minutes.
Why is this happening so randomly? What is actually wrong and how much do you think it will cost to fix? Thanks so much Kacey. I suggest you take the laptop to an Apple Service Center. You can use the Get Info window in the Finder to give yourself access to your files from another admin account, or boot the iMac in Target Disk Mode and access from a second system. Mac OS X When I try to log in it goes to the page with Finder in the menu bar and then 2 or 3 seconds later goes straight back to the login page whether or not I click with the mouse or try using the keyboard.
We tried changing the password but it makes no difference. My daughter is the administrator so we can log in as her and use the computer but I am unable to access the documents I have under my log in. Please can you advise how to correct this so I can log on or is there a way to access my documents through her account? I am not that computer literate but have tried searching through the Apple help menus to no avail. Kind Regards Karen. Mac repair guy said… oh you saw the kernel panic before the problem?
I wasnt aware of what it was called.
Power Mac G5 won't start
Now I find out tomorrow how serious the issue I have to pay for is. I still get a grey screen — no logo. One day, it decided not to even give me the POST chime. I said no thanks and went home. This time was no exception. I unplugged everything from the logic board except for the power supply and video connections and hit the power button.
Sure enough, I got a chime.
How to fix common Mac startup problems [MacRx]
Began plugging things back in one at a time until I found the culprit. Turned out to be the hard drive temp sensor. No expensive logic board replacement, just a little temp sensor board. I sometimes think back and wonder what excuse they would have come up with after a new logic board did nothing to fix the problem. After a week or two new battery is dead. Rather costly to replace battery times a year. Otherwise this old wind tunnel is working perfectly. My OSX shows firmware password screen which i have no idea why it started coming up but i can bypass it sometimes by holding cmd-apple-o-f keys but the keyboard doesnt work..
I tried holding down the alt option to choose a different drive to startup from but nothing happens, so I put in a Snow Leopard disk and now it starts up to a screen telling me to change the batteries in my mouse. Have any ideas? My email is namizich gmail. There probably was a logic board issue after all.
I found it hard to believe myself, but it's what happened. I subsequently managed to retrieve the machine and reset the PMU - now it works fine. There was nothing wrong with the logic board. Resetting the Power Manager for a none starting Mac is a standard procedure and is fully documented on apple knowledgebase. I not sure why it appears as a hint on this in When Mac users have been using the technique for years. What is important to know is that you must neve reset the PMU button twice in a row. You must leave at least 10 to 15 seconds if you think you need to press it again.
If you do press the button twice you can crash the PMU which would cause the batttery which normally last for years to expire in 3 days. As well as keep your machine from ever booting again without replacing the logic board They are: Unlpug the power cord. Using a non-metalic tool your finger, if it'll reach push the PMU reset button location varies by machine ONCE and for no more than one second. Wait seconds. Plug the power cord back in and hit the power button. Note that a bad logic board, processor or stick of RAM can cause the same symptoms described by the original poster so a PMU reset is no guarantee.
I don't know where the myth came from that suggests if you crash your PMU you need to replace your logic board but it's not true. The most you can do crashing PMU is to expire the battery. For those that want the official procedure for resetting the PMU here it is. The PMU is a computer within a computer. Its function is to: Be very careful when handling the logic board. If the PMU crashes and is not reset, the battery life goes from about five years to about two days.
Power Mac G5 won't turn on
Many system problems can be resolved by resetting the PMU chip. When you have a computer that fails to power up, follow this procedure before replacing any modules: Disconnect the power cord and check the battery in the battery holder. The battery should read 3. If the battery is bad, replace it, wait ten seconds, and then proceed to step 2. If the battery is good, go directly to step 2. Press the PMU reset button once and then proceed to step 3.
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Wait ten seconds before connecting the power cord and powering on the computer. If the computer does not power on, there is something else wrong with it; refer to the "System" section of "Symptom Charts" in this chapter. The above procedure resets the computer's PRAM. After resetting the PMU, be sure to reset the time, date, and other system parameter settings.
I have had a number of clients with un-revivable logic boards who've told me that before bringing their machines in for service, someone they knew told them to either hit the PMU reset button several times in a row or even to hold it down for thirty seconds or more. Granted, this is just a correlation and not a proven cause and effect - more likely these folks may have just had an ESD incident while they were dinking around inside their machines or the MLBs had already failed in some other way - but why take chances?
BTW, thanks for posting the official procedure. It's reset by simply unplugging the power cord for 15 seconds. I would hazard a guess that Apple may be tired of all the warranty logic board replacements that they've done because the user did an improper PMU reset Here is another hint: A workaround is to get a small piece of paper something which is a bit stiffer than normal paper works best like a matchbook, index card, etc.
This effectively disconnects the battery. Wait a good minutes, then remove the paper, and start up. This is a copy of an email I sent in response to a mailing-list posting about a system that sometimes spontaneously re-boots after being shut down and sometimes won't boot when the power button is pressed it was a MDD PowerMac. My edited response to the poster was: It turns out that some of the ATI Radeon graphics cards e. I've found that using some VGA cables i. Anyway, I hope this helps someone I bought a used G4 Quicksilver at auction. It looks in great shape, no damage, cracks or signs of misuse.
Anyway I have no luck in getting it to power up. The Front panel light will not stay lit, but the fan is running and the little red light on the mother board is lit. I replaced the battery and used the info you guys posted about the power button located on the board also, but still no luck. Any other suggestions? I have to to the same thing to power up my cube, the only problem is that it only works once. After turning the power off I have to redo the hole procedure to start it up again. The following check list is from the cube engineers manual. As you can see everything points towords replacing your logic board if yoru rule out issues with the power supply, dc-dc Board etc.
If have resetting your PMU your still getting issues and you've followed the procedure here, then I would use the hard ware test cd that came with your cube which will test your logic board. You would also get much more advice about your issue over at the disussion forum at http: No apparent power no sound and power LED is not lit 1.
Verify the power outlet is good. Replace the power cord. Reset the logic board. Check for trickle voltage on the power adapter connector. Refer to "Power Adapter Verification" in this chapter.
If verification fails, replace the power adapter. Disconnect external devices, including the monitor, and start up the computer. Remove internal cards and start up the computer. Disconnect internal hard drives from the logic board and start up the computer. Reseat the DC-to-DC board in its connector. Check the modem connector. If the connector has any bent pins, replace the logic board. Replace the logic board.
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