Imac g5 no power

We have an iMac G5 that we got from my sister-in-law a few years ago. Our son used it for a couple of years and then got a MB so it sat for a year or so and then it stopped working. He said he wouldn't power up-it might start but wouldn't stay on. Is it time to trash this computer? Of course it could be a number of things wrong with it but I am thinking power supply. Expensive to replace? Worth it? Thanks! Judy

It could be the power supply, but try a couple of things first. Reset the SMU and the PRAM and see if that helps.

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My brand new iMac will not power up after an update restart, any suggestions?

Any suggestions on why my IMac will not power up after it done a restart?

Try an SMC reset and PRAM reset: https://discussions.apple.com/docs/DOC-3603
If that doesn't help:
See if it will start in Safe Boot: restart holding down the Shift key until you see a grey progress bar, type your admin password when prompted, let it continue to (hopefully) boot. Restart as normal from the Apple menu.
If that didn't help, try booting into the Recovery HD: restart holding down Command+r and choose Disk Utility from the four choices when they appear on screen. Once DU has launched select your Macintosh HD on the left and click on 'repair disk'. If anything gets changed click on repair disk again until you get a clear pass, restart as normal from the Apple menu.
If you still have problems, give AppleCare a call.

My iMac wouldn't turn on. This has happened out of nowhere, it was working really well before. checked my power cord and outlets everything's fine. The iMac has no power at all. no sound or anything, completely dead. It is only 1 year and 2 mos old.

My iMac wouldn't turn on. This has happened out of nowhere, it was working really well before. checked my power cord and outlets everything's fine. The iMac has no power at all. no sound or anything, completely dead. It is only 1 year and 2 mos old. Any idea what it could be?

I have purposely been ignoring your responses to my posts about the heat issues in the newer design iMacs, but if you want really want to ague the point...
First, the iMac is marketed as a desktop model Mac. Not a laptop or MacBook.
I have never owned a MacBook, so I can't attest to how much heat the MacBooks generate.
I Have two iMac models. A 2009, 27 inch screen iMac for myself. And a 2010, 21.5 inch screen iMac for my Fiancée.
As a desktop Mac these are hottest running desktop Macs I have ever owned. Period. I owned two beige Macs, a pre-G3 tower, aG3 desktop, a G4 MDD Tower, the original iMac, eMac, iMac G4 and now my current iMacs.
None of my previous Macs have ever, EVER ran this hot. I have never, also, had any component failures in any of the previous Macs I have owned, either. All of my Macs have been upgraded or modded to some degree over the years. About 2 years ago I had to press my old G3 back into service. Both my G3 and G4 models have been heavily modded. The G3 ran without issue for a close friend for over a year until that friend went out a got a Mac Mini.
That's a 1996-97 Mac my friend. And it still is in working order and hasn't had any failures.
The fact I am pointing out here is that heat is an enemy to electronic components.
Whether desktop iMac or MacBooks, tightly packed enclosures of heat generating computer components with fans that do not run fast enough at most times to cool off the interior or exterior, will and does slow roast computer components to premature failure.
I do not know how frequent component failure is in the MacBook line up. So I can't attest to those.
I do not participate in those forums.
This is why at some point in computer history, Super Conputers were liquid cooled. PowerMac G5 systems were liquid cooled because they ran too hot!
I have taken my own precautions to keep my iMacs' heat down as much as possible.
I don't have the money to keep buying a new Mac every 3-5 years when some catastrophic failure happens.
I had to purchase my iMacs used as I couldn't afford the cost of a new iMac with the specs I needed.
My idea, your idea and Apple's idea of acceptable operating temps we can argue all day long.
I feel, personally, that the operating temps are too high and exacerbate operational issues.
I Have been participating in these particular iMac forums for just over a year and have seen plenty of posts of iMac component failures due to both heat and dust, dirt issues from within the iMac.
There can be no other reason for all of these failures. The SuperDrive is, usually, the first to go bad.
It's probably due more to its vertical mounting, but the excessive interior heat isn't helping it.
Next to fail is the GPU. The last to fail, but the most expensive to fix, the Logic Board.
I Have seen plenty of posts in my last year here of all of these failures in iMac less than 5 years old and ,perhaps, a little older. 2008 model iMacs seem to have their issues, too!
Apple is focusing too much on design and aesthetics, rather than longevity of their products, I feel now.
A Mac isn't going to last 7- 10 years anymore.
I don't have stats and numbers. Just common sense.
This is my story and I am sticking to it. For what it's worth.

Myth or Truth, iMac uses less power in Standby than when off

I'm sure I read this somewhere on the internet.
I'm not sure what model it was for, but I heard that the imac uses less power when in sleep than being shutdown (when still plugged into the wall)
Can anyone confirm or denigh this?
Ifs it true any web links to this?

If it's powered off, it's using no power at all.
I suspect this is about the power cost of waking from standby versus pwoering up from off, and whether it makes more sense to leave your Mac in standby when out of use or whether to swticth off completely.
It depends on your usage pattern. If you leave the Mac unused for very long periods of time, it makes sense to power off, because standby uses a little power constantly. If you leave it unused for shortter periods, you probably use less power in standby.
Unfortunately, I don't have a magic number for the time period
As a rule of thumb, I'd say if it's unused for less than a day or so, standby makes more sense. There's a discussion at the link below which also fails to give a definitive answer but has some interetsing comments.
http://apple.stackexchange.com/questions/7588/for-least-power-usage-should-i-tur n-off-or-put-my-mac-to-sleep

HT1750 I tried to change the memory and now my Imac will not power on. and there are no beeps. what did I do wrong?

I tried to change the memory and now my Imac will not power on. and there are no beeps. what did I do wrong?

Don't know. Could be any number of reasons. Re-read the how to install RAM manual again for your model iMac. Double & triple check to make sure you purchased the right RAM chips. Make sure they are seated properly. If you didn't hear a snap when seated, the RAM is not properly seated.

TS1587 My iMac will not power on .

My iMac will not power on

Hi I have some weird problem related to this and unfortunately either or apple or APS able to solve.
I have picked a 27 iMac late 2012 model 2 montsh back and a APC Back up UPS 700.
Whenevr I turn on the Main power> Turn on APC> Turn on iMac, the iMac doesn't turn on. I will have to unplug it and plug it back it works. It happens only when I start the UPS for the first time in the day. After that how many ever times I remove my iMac plug and plug it back to APC, it turns on.
Initially I thought, it is the problem with the UPS and contacted APC where they replaced with a new UPS and its the same problem.
Unfortunately, Apple is not able to tell that its the problem with the Apple iMac as it works fine when directly powered without using APC.
So, the problem lies working with APC and iMac together.
Could someone please help. The last option I have is to carry the UPS to a Apple store and see if it works fine with any other iMac.
Also to mention, I did try SMC reset adn PRAM reset.

My iMac will not power up

My iMac will not power up. It is a late 2008 21.5 inch. Any suggestions, tricks, soothsaying, or voodoo that one can apply here would be a great help. Thanks.

If it doesn't have any video and doesn't make any sounds take your 20" (not 21.5") 2008 iMac in for repair, it has suffered a hardware failure. When you say it will not power up please be more descriptive, what exactly happens when you hit the power button and what troubleshooting have you tried?

Has anyone had a problem with their imac because the power company installed a smart meter which broadcasts the readings to the company?

Has anyone had a problem with their imac after the power company--in my case Pepco in Washington DC--installed "smart meters" which read the meter and transmit the data via wireless? I've had trouble and when I move the imac downstair it disappears. Help!

barryfromwashington wrote:
would putting up a metal shield by the meter help?
It might, as long as the shield is grounded. Metallic (such as copper) window screen is often sufficient.
As mentioned, it would not hurt to file a complaint. The burden of proper shielding should probably belong to Pepco. Among other things, the FCC frowns upon RF leakage and its interfereing with radio communications. Besides, Pepco probably would not want you to affix a shield around their gear - liability issues, etc.
You could experiment by temporarily hanging a shield-screen on the inside of the wall, behind where the meter transmitter device is located, and see if there is any beneficial change.

I Have just returned from a 2 week vacation and had left my iMac plugged in, I noticed we suffered a power cut during our absence from home and now the iMac won't power up, help !

I Have just returned from a 2 week vacation and had left my iMac plugged in, I noticed we suffered a power cut during our absence from home and now the iMac won't power up, help !

What have you tried?
A safe boot?
A recovery boot?
Allan

Do the iMacs run on power?

Do the iMacs run on power instead of batteries like in laptops or MacBooks. Does it have a thing like UPS in desktops? I want to know everything about them. How it runs?

I presume you mean "AC power". The iMac does not run on batteries as do laptops such as MacBooks (MacBooks are laptops). That's why people buy a UPS, to keep the iMac running in the event of a failure of the power in your wall socket.
Regards.

1st Gen iMac G5 - no power warranty ?

I have a first generation iMac G5, and my serial number falls into the ranges cover by the iMac G5 Repair Extension Program for Video and Power Issues.
My issue is that I've already had my global logic board replaced under this warranty, and now my iMac is not functioning again. I've already tried the SMU reset button, and I also followed the directions found in the help article "iMac G5: Troubleshooting when your computer won't turn on", and my out come was:12. Press the internal power button to start up the computer. Does LED 2 come on momentarily, or not at all?* Momentarily: The logic board has detected power, but the power supply cannot maintain it. Your power supply needs to be replaced. If you have an iMac G5 (Ambient Light Sensor) computer, you can order a replacement power supply here and then install it yourself. If you have any other iMac G5 computer, contact your local Apple Retail Store or Apple Authorized Service Provider for service.
* Not at all: Your logic board needs to be replaced. Please contact your local Apple Retail Store or Apple Authorized Service Provider for service.
I suppose my primary concern is if my iMac is still covered, or am I going to have to pay for this repair? The iMac is only 2 years from purchase date, so it does still fall under warranty time-wise. I'm more worried about the previous board replacement voiding my eligibility.
17 1.8Ghz iMac: 1.5GB RAM, 80Gb HD, Bluetooth Mac OS X (10.4.9) Black 60GB 5G iPod

Per Apple Extention Repair program:
"the repair will be covered by Apple for up to three years from the original date of purchase even if your iMac G5 is out of warranty."

What can happen to an intel-based iMac when a power outage occurs while it is on and I unplug it to avoid a surge when power comes back?

The power went out today, while I was using my intel-based iMac (2008) and I rushed to unplug the power from the wall, before the poser could surge back on. Did I do damage?
I have a surge protector that it was plugged into, but I thought just to be safe I should unplug!
Thanks, Group!
artdough

Good point!
Art a surge protector (a good one) is designed to provide contant power to the devices that are plugged into it. This is good in the event of a surge of power up or down however in the event of a complete power outage they're of no value.
A UPS (Uninteruptable Power Supply) is just that, it has surge protection like a surge suppresor however it also has a battery integrated into it. The battery is designed to provide enough power for a user to do an orderly shutdown. In addition most UPS's can also plug into your iMac via a USB cable. Then you can set energy saver preferences that you cannot see now. For example you can set how long the computer should run in the event of power going off. You can also set if you want the computer to reboot or not when the power comes back on etc. For about $100 you can get a fine UPS that will add an additional layer of protection for your computer and give you extra peace of mind.

IMac G5 17" - Power Issue

Hi,
I have an iMac G5 17" with light sensor, recently it had turned itself off, I went to power it back on and nothing happened.
I have gone through the procedure to reset the SMU and I have also tested another PSU. Capacitors and components appear fine, nothing out of the ordinary.
When iMac is plugged in and power button is pressed, diagnostic LED #2 turns on for a split second, again I have tested this unit on another perfectly working PSU, the original PSU from the unit has also been tested in another G5 iMac left on for a whole day and no issues occurred.
Can anyone help?

Hi luna-nz and welcome to the forums.
This will probably sound silly , given the tests you have already done, but is there any possibility that the "collar" on the power cord where it enters the machine has become a little displaced? When these computers first came out we were seeing numerous situations where a slightly displaced "collar" could result in sudden power drop outs because the power cord wasn't seating properly.Simply pulling the collar further up the cord, and then making sure the plug itself was firmly seated, would rectify the problem.
A long shot, I'm sure, but worth checking if you are sure the power supply unit itself is not the issue.
There were also some situations where the power switch itself could fail, leading to sudden power drop outs and difficulty restarting. To test this, if you have access to another identical iMac (as it appears you do) , you could simply try swapping the backs on the two machines.
Cheers
Rod

Imac g5 wont power on?

i have an iMac G5 that i recently bought from one of my dads friends who had never really used it. (he had also bought it used)
my problem:
when i push the power button the fan turns on very quietly and softly. and after a bit it starts to work really hard, no start up sound is heard and the screen doesnt turn on.
I have reset the PRAM and the SMU and both methods only worked once in a while.
and when it did turn on it would freeze (sometimes after a while and sometimes right off the bat) and id have to shut it down,
I have checked the diagnostic LEDs and the power supply is running as it should.
only things that are noticable with this computer when i opened it up was that
-there was no fan cover
-the middle screw was stripped
-the power cord isnt an authentic iMac power cord, it looks to be one from an old windows computer or something of that sort.
i am also not using an apple mouse or keyboard

If you have the original install disc, boot from it and run
Disk Utility
   1. Insert the Mac OS X Install disc that came with your computer, then restart the computer while holding the C key.
   2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
      Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.
   3. Click the First Aid tab.
   4. Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
   5. Select your Mac OS X volume.
   6. Click Repair. Disk Utility checks and repairs the disk.
   7. Reboot from internal drive
Let us know what you find out, please.

IMac G5 blinking power light / won't turn on

When my iMac G5 is hooked up to power, the power light (front bottom right panel) faintly blinks once every 2 seconds or so. The monitor is not on at all, and the computer does not appear to be running (no sounds).
All other devices hooked up to that particular power outlet are working fine, and pressing the power button does nothing. Holding the power button down halts the blinking, but when I let go the blinking resumes.
I have also tried removing all devices attached to the computer, including the keyboard and mouse.
This machine was working fine on friday, but when I came back into work today (monday) the machine was 'off' and nothing I do seems to cause any change.
Very confused, any help appreciated.

It may be that your Power Supply Unit is failing, look at the suggestions here, try them and if nothing works, call Apple. If you have a Rev A, you may qualify for the Repair Extension Program. (sorry to assume you didn't know about sleep, sometimes very basic things are not known to posters).
Please let me know how you make out,
Miriam

IMac G5 has power but no display

I bought an iMac G5 iSight 17" from my neighbor thinking I could get it work, then afterward learn some more about Apple computers. It powers up fine but the screen is dark. I bought another lcd online for $100+, took the front panel off, and installed it but same issue is happening. One thing I did notice during re-assembly... the front plastic cover that slides off away from the lcd has 2 connectors on top: a thick one for the camera, and another 2-wire one that leads into a small round silver cylinder inside the top of the plastic cover (maybe a ground?). Anyway one of the two wires that go into the cylinder is broken. My question is what does this wire control? And could this be the reason neither of my displays works? Thanks for any help out there. I'm NEW to iMacs.

Hello,
At this point I think your best bet is to take it in for servicing at the local service center.
As for your data, I think odds are that it is still in-tact. The type of failure you describe sounds more like a failed logic-board or possibly the power supply (improper voltage / low-voltage).
Most likely it's a failed logic-board. But, the power supply can cause these symptoms as well.
Neither would mean that your hard drive is bad. It's possible that it is, but it's not an automatic definite.
If it were only the hard drive that failed, then you'd get the grey Apple screen with a flashing question-mark.
So, what I would do, is request them to fix the computer. But, I would put a stipulation on it that requires them to call you if they are going to re-format or replace the hard drive.
This way you'll know in advance if they are going to erase your data. You could then decide whether to pay them to archive it onto another media or back it up for you, or just let it go.
Explain to them that you have information you are concerned about saving. And, request them to at least let you know if their repair process is going to require them to do anything that might erase the hard drive.
I think that's about the best you can do at this point.
I hope this helps.

Imac g5 no power

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