IMac won't turn on and fans come on right when plugged in

An iMac I have won't turn on but the fan runs. I don't even have to turn it on, I just plug it in and they go on. When I press the power button nothing, but the fan still runs. I have to unplug it to stop them.
Does anybody know anything I can try to see if I can get it working again?
Thanks.

You may be able to see if the situation changes somewhat by trying a
reset of the power management unit, via a button hidden in a location
beneath the iMac (G4) base plate. See info in the following page links:
• Resetting the iMac (Flat Panel - G4) Power Management Unit (PMU)
http://support.apple.com/kb/HT1712
• How to reset PRAM and NVRAM:
http://docs.info.apple.com/article.html?artnum=2238
Before attempting to perform either reset, read through each of the
pages to see what they have in mind; could be a PRAM reset may
do OK. Or both may lead one to consider entirely different actions.
If PMU button is held too long an otherwise healthy PRAM battery may
have a shortened life; or a weak old battery may already be dead. The
battery (a 1/2AA 3.6V Lithium cell) keeps the system settings current.
There is a possibility the unit may have some other hardware issues, too.
Troubleshooting one of these without an official service manual or trained
iMac G4 technician (is there an antique iMac doctor in the house?) can be
a tedious process; as the official tech manual will refer to replacement of
original parts with known-good official ones, as part of an extensive repair.
After the PMU is reset, perhaps it may boot up; or may boot from an install
DVD or CD. An original Apple Hardware Test for the computer may be of
some help in general diagnosis; but even bad hard drives can pass, at times.
Is there any other indication of the computer trying to run, other than Fan?
That's hard enough to hear much else inside the case, with the fan running.
(There is only the single fan in the top of the housing; to pull air up/out.)
Which specific iMac G4 build version do you have? (700/800/1.0 or 1.25)
There is an iMac take-apart page, if you decide to go into it for the duration.
• iMac G4 Take-apart for Optical drive, Hard Disk drive, & Ram upgrades:
http://www.xlr8yourmac.com/systems/imacg4/imacg4takeapart.html
Hopefully it will arise and do more than just push room air...
Good luck & happy computing!

Similar Messages

  • Imac won't turn on and gives me 3 beeps

    Ok - I am completely clueless here. My father's iMac - left overnight in sleep mode - won't turn back on. I held down the power button and waiting for over a minute, then turned it back on. It gave me 3 loud beeps and won't turn back on - the power button light flashes green and yellow. Anyone have any ideas what is going on and if this is fixable? HIs computer is an iMac G3 333mhz (I think)
    Odd things that have been happening the past month or so: Safari browser gone out of whack - graphic / text loading funny - Switched to Firefox. MAIL started yesterday acting weird. Usually left open, but with the window closed - was unable to open window. When I selected new message window I would get a new window the folders wouldn't show, nor would the toolbox on top. Had to go to the menues and have them show. But then I closed this window, another window, without these feature would appear and I would not be able to close it at all. Finally had to delete the preferences and add the email accounts info again for it to work again properly.
    I have no idea if this was telling me that something was starting to be wrong with the computer. I just took it that my father did something he wasn't suppose to do (He is really computer illiterate and can only do basic stuff on the computer when he's alone)
    I hope he hasn't lost his computer completely - I don't want him having to use MINE (for the reasons above!)
    Any help would be greatly appreciated!
    Rebecca

    It may be marginal or defective memory that's causing the problem. This Forum is dedicated to the older CRT-screen iMacs, so I'd suggest that you post a new topic describing the problem in this Intel processor-based iMac Forum.

  • Iphone won't turn on, and says 'unknown error 2009' when trying to restore?

    this morning my iphone turned off and wouldn't turn on. I plugged it into the charger and it said to connect it to itunes. Once i finally did that, at first it couldnt detect it but now it keeps telling me an iphone has been detected in recovery mode and to sync it I need to restore it.
    Here's the problem, everytime i try to restore it, it comes up with something along the lines of, it cannot restore becvause of 'unknown error 2009' and as soon as i unplug the phone it turns off. What can I do?

    I was doing some research on this problem for a friend and came across your post and thought I should share this:
    https://discussions.apple.com/thread/5372052?start=30&tstart=0
    Hopefully it helps, good luck.

  • My iPhone 4s won t turn on and the motherboard gets hot when I connect the battery

    Attempted to replace my front and back glass (for the second time, first time was successful) and i'm not sure where I went wrong but as the title says... it will not turn on and as I connect the battery to the motherboard it starts to get hot immediately after trying to turn it on. I have included a picture of the mother board, the area that gets hot is in the red square.

    Sorry, but we can't help you with problems occurring after you have opened and tried to fix some hardware of the phone, due to the Terms of Use of these discussions.
    The warranty for the phone is gone now and Apple will not service the phone either anymore. You'll have to look for a 3rd party repair center to get that fixed.

  • My IMac won't turn on and it's plugged in and the batteries on the mouse and keyboard work. What's the problem then?

    I have an IMac and I tried to get on it this morning, but it wouldn't start when I touched the mouse pad. I tried this a couple more times, and then I tried it with the keyboard. I got the same results. I know there are fresh batteries in there so I didn't see what the problem was, so I tried turning it on, and I got no reaction. My IMac is plugged in and everything so what's the problem?

    Make sure the outlet is OK. could have tripped circuit breaker.
    Then try resetting the SMC
    Resetting the SMC for Mac Pro, Intel-based iMac, Intel-based Mac mini, or Intel-based Xserve
    Shut down the computer.
    Unplug the computer's power cord.
    Wait fifteen seconds.
    Attach the computer's power cord.
    Wait five seconds, then press the power button to turn on the computer.
    If it still fails to turn on you need to make a Genisu Bar appointment at an Apple Store or contact Apple Support.

  • My computer won't turn on and the screen is black, I plugged in my charger and the light is flashing yellow/green. How can I fix this?

    It was working about a half an hour ago, then I changed outlets and now it's not working in any outlet I try.

    Ok i solved it
    i just realised what a stupid question this is because it has allready been asked like 1000 of times.I guess i was kinda worried and stressed that i didn't first search around a bit on the forum before making this topic.
    So sorry for making a unnessecary topic once again!
    i phone is on and works perfectly fine again.
    thanks anyway!
    bye! x

  • IMac won't turn on. Only a clicking sound and a grey folder with flashing question mark.

    iMac won't turn on. Only a clicking sound and a grey folder with flashing question mark.
    Help.

    Your iMac is actually turning ON as proven by the grey folder with the flashing question mark.
    The flashing question mark indicates that your system is unable to find a bootable volume. The clicking sound that you hear is probably coming from your hard drive while it tries to recalibrate. I suspect your hard drive has failed.
    What model imac do you have? If it's under warranty I suggest taking it in for service. Hopefully you've been maintaining a regular backup of your data as all users should. I lost my data once and it was a valuable lesson. I back up regularily now.
    If your iMac came with install disks then you can boot from them, choose your language when asked, then pull down the Utilities menu to launch the Disk Utility application. The Disk Utility application will allow you to verify whether your hard drive has an issue. Usually a clicking sound, assuming it's coming from the hard drive, is a sign of a bad hard drive.
    If your system has Lion installed then you can hold down the Command and R keys when you restart the system, then launch the Disk Utility application from the menu that appears.

  • My ipad is stuck inbetween on and off.  The screen is black with the white apple in the middle.  It won't turn off and it won't come on.  anyone know what is wrong?

    My ipad is stuck inbetween on and off.  The screen is black with the white apple in the middle of the screen.  It won't turn off and won't come completely on.  Anyone know what is wrong?

    See if this lets the iPad start up.
    Reboot the iPad by holding down on the sleep and home buttons at the same time for about 10-15 seconds until the Apple Logo appears - ignore the red slider if it appears on the screen - let go of the buttons. Let the iPad start up.

  • Since iOS 7.1 my phone won't turn on and is asking me to connect to iTunes. I connect to itunes and it says it needs to be restored. Not sure why. I try to restore it and then it says something went wrong and it won't work. So I've been without my phone

    Since iOS 7.1 my phone won't turn on and is asking me to connect to iTunes. I connect to itunes and it says it needs to be restored. Not sure why. I try to restore it and then it says something went wrong and it won't work. So I've been without my phone for a couple days now. It gives me error code (29). The phone almost reboots and then 3/4 of the way through it gives me the error message.

    If using windows...
    Temporarily disable your firewall and antivirus software and try again...
    http://support.apple.com/kb/TS1379
    See iTunes Connection Issues here...
    iTunes for Windows: Troubleshooting security software issues
    NOTE:
    Make sure you have the Latest Version of iTunes (v11.1.5) Installed on your computer
    iTunes free download from www.itunes.com/download

  • My iphone 5 stopped working, it won't turn on, and i tried charge it yesterday and today

    My iphone 5 stopped working it won't turn on, and i tried charge it yesterday and today

    Hey raphaccarvalho
    If your iPhone is not powering on, then check out the article below to see if you can get it to power back on. You will want to start at step 3 to try and reset it by holding the Sleep/Wake button and Home button for about 10 seconds and see if the Apple Logo comes up.
    iOS: Not responding or does not turn on
    http://support.apple.com/kb/TS3281
    If a single application is not responding or stops responding when it opens, you can force it to close.
    If the device is unresponsive or if certain controls aren't working as expected, restart your device.
    If the device remains unresponsive or does not turn on (or power on), reset your device.
    If there is no video or if the screen remains black, verify that the device has enough charge to turn on:
    If you are using an iPad, ensure that it's connected to the USB Power Adapter supplied with the device.
    Let it charge for at least twenty minutes, then see if it starts normally.
    If there is no image on the screen, press the Sleep/Wake button to attempt to wake the device.
    If the screen displays a red battery icon, continue charging the device until the battery is fully charged. Learn more about charging iPhone and iPod touch, or iPad.
    If the above steps do not resolve the issue, or the if the screen remains black or shows a persistent Apple logo, try restoring with iTunes:
    Connect the device to your computer and open iTunes.
    If the device appears in iTunes, select and click Restore on the Summary pane. Learn more about restoring iOS software.
    If the device doesn't appear in iTunes, try to force the device into recovery mode, and then restore it.
    If the above steps do not resolve the issue, contact Apple.
    Regards,
    -Norm G.

  • Computer won't turn on and the power cord doesn't light up

    My problem with the computer is that it will not turn on. The battery is fully charged, power cord is plugged into a working outlet. I have held down the power button for 10 second or even longer. Nothing turns it on and the power cord doesn't light up at all. Any thing will help.
    Thanks

    First, check that your AC outlet has power. Second, see this article: Intel-based iMac- What to do if your computer won't turn on and this one Resetting MacBook and MacBook Pro System Management Controller (SMC).

  • My iphone 4s won't turn on and it is in DFU mode, but my computer can read the device..... PLEASE HELP :((

    My iphone 4s won't turn on and it is in DFU mode, but my computer can read the device.... PLEASE HELP , and my iphone is not jailbroken

    http://www.youtube.com/watch?v=uuulql2u37U The title is "DFU Mode vs. Recovery mode - Which is Which? and How to Enter AND Exit (iphone, ipod, ipad) It helped me, Hopes it Helped you! Also you do not need to Restore! 

  • My ipod won't turn on and it won't stop displaying do not disconnect

    The do not disconnect icon will not go away but my ipod also won't come up on my itunes so i can't eject it from there. so i just disconnected the cord anyways because i was annoyed. now it won't turn on and keeps showing the folder with the ! and under it apple.com/suppport/ipod and when that goes away the do not disconnect icon comes back up. any hope that i can fix it without sending it in? thanks!

    Welcome to Apple Discussions!
    See this...
    iPod Displays A Folder With An Exclamation Point
    btabz

  • Imac won't turn on after anti virus software downloaded

    The Avast antivirus software was downloaded onto my imac and now my imac won't turn on. What should I do?

    Troubleshooting: My computer won't turn on
    Read and follow all the steps.
    If you find yourself at Step 6 determine if you can start the Mac in "Safe Mode":
    Safe Mode or "Safe Boot" is a troubleshooting mode that bypasses all third party system extensions and loads only required system components. Read about it: Starting up in Safe Mode
    You must disable FileVault before you can start your Mac in Safe Mode.
    Starting your Mac in Safe Mode will take longer than usual, graphics will not render smoothly, audio is disabled on some Macs, and some programs (iTunes for example) may not work at all.
    Merely starting your Mac in Safe Mode is not intended to resolve the problem, it's to observe its performance without certain additional components.
    To end Safe Mode restart your Mac normally. Shutdown will take longer as well.
    Remove the Avast garbage by using its uninstaller. Never install it, or anything like it, ever again.

  • My macbook screen won't turn on and it keeps beeping at me...help!

    I tryed turning on my macbook pro 13'' and the screen won't turn on and it keeps beeping at me and flashing the white light on the front of the computer at the same time.  any suggestions?

    Beeping sounds usually indicate a RAM or logicboard problem.
    If you have third party RAM recently installed, put the factory RAM back in.
    Use the free MacTracker to find out your correct RAM spec and return the defective RAM for a exchange or buy top tier RAM from Crucial.com or OtherWorld Computing.
    If you didn't mess with the RAM, take the machine to Apple for a free eval.
    You might want to read this if the repair bill is not worth it.
    My computer is not working, is my personal data lost?

Maybe you are looking for