Power mac g5 wont start

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.


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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.


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Mac repair guy said… oh you saw the kernel panic before the problem? I wasnt aware of what it was called. 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.

Power Mac G5 won't turn on

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. 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. What is going on? I have a Macbook Pro, It has had a new hard drive now, as the old one died, I also apparently have a new motherboard because there is a generic problem with my competer models boards so this was replaced free of charge. My problem now is that when I turn on my compter it takes ages of just freezes showing a world flashing. This is made worse If i have the internet connected. If i desonnect the internet I am able to resart my compter and it will eventually startup.

Power Mac G5 won't turn on | MacRumors Forums

I have so much work to do but I can not trust my machine. What s wrong with my computer? That is: Norton finds the Desktop Folder is to blame: How can I resolve? If I start from a CD, all data is just there as normal. Hi, I have a quick question and am hoping someone might me able to help?! I have a MacBook Pro and it is locked with a password. Both times I turned the computer off and it flashed really bright and made a clinking noise. I turned it on later and it worked fine. If not, is there anyway to turn off the computer more safely?

I recently tried to change the permissions on the main OS drive where you click get info and allow everyone to read and write and I applied it to all enclosed items…what happened was a series of windows saying such and such software was improperly installed please reinstall it…. I had to click ok for 2 straight minutes… so I tried repairing disk permissions while it was still running…it would just kick up the same windows as mentioned above and stall the permissions task… so I tried to restart the computer….

I have not successfully got safe boot working, once it gets past the loading bar it goes to staying on the gray logo screen forever…. Is my only hope reinstalling the OS and losing all my data? Would upgrading to the latest OS help? 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.

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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. 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.

Power Mac G5 won't start

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. 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.

How to fix a Mac Pro that won't turn on

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.

How to fix common Mac startup problems [MacRx]

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. Lost your password? Powered by the Parse. More Mac Sites: Macworld MacUser iPhone Central. A possible fix for a Mac that won't power up Apr 11, '05 I have a client that has a Mirrored Doors G4.

When you pressed the power button, the button would light up, but the computer would not turn on. Initially I thought it was a power supply problem, as the fans on the power supply wouldn't turn on.