Question about Apple 21.5" iMac Desktop

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Imac bluetooth and usb not working

I have imac 21.5", usb and bluetooth not working, so i can't to pram reset. I did the sim reset, but still doesn't work. Keyboard and mouse not working.

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  • 3 Answers

Simply you can't alone, probably you have problems with your southbridge on motherboard. Usualy this can be solved with rebaling. Is a common problem because - probably - you not clean your mac regulary.

Posted on Nov 30, 2013

Testimonial: "Thank you for your replay! It can't be the power supply?"

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Posted on Jan 02, 2017

KenKaBob
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SOURCE: Keyboard and Mouse don't work anymore

Hi, Sorry you are having problems,
Well Marcelo, the first thing to do in a situation like this is to restart your Mac or even better, shut down and restart. So, if you have done this, and still the keyboard and mouse don't respond, and, as you have mentioned, you have tried the other USB ports on the back of the Mac, it sounds like somehow, unexpectedly, your iMac motherboard got a shock of some kind and it killed the USB controller....
Last thing to try is to unplug the iMac completely of everything and let it sit for 10 minutes and then plug just the keyboard and mouse back in and try to see if that does the trick..
Otherwise, Apple will cover this if it is still under warranty.
Good Luck.

Posted on Apr 02, 2009

imend
  • 66 Answers

SOURCE: iMac bluetooth mouse won't move cursor

Did you seperately setup the mouse? Even if you have, go into the Bluetooth preferences under System Preferences. Select the mouse & delete it. Setup a "New Bluetooth Device" and select "Mouse." Be sure to press the Reset button for 2-3 seconds to get the mouse into "Discoverable" mode. Your Mac will then setup the mouse automatically.
If this does not work, the Bluetooth chip in the mouse may be defective.

Posted on Apr 07, 2009

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SOURCE: mouse and keyboard will not work

Does your imac have the proper bluetooth? If this is a new issue with existing equipment open the bluetooth menu and find devices. You may need a wired mouse to get the proper fix set.

Posted on May 02, 2010

Macs R We
  • 481 Answers

SOURCE: imac Flash Player locks up Bluetooth then crashes

Do you know for a fact that Bluetooth is at all involved? Try attaching a wired mouse -- if the wired mouse also freezes, the problem does not involve Bluetooth.
Flash is notorious for causing system problems on Macintoshes. Try reinstalling the most recent version of Flash.

Posted on Jun 18, 2010

Testimonial: "Bluetooth KB dies same time as mouse. USB mouse continues to work. I did get latest Flash. I guess you're right,Flash and Macs don't mix well! Thank you for response."

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SOURCE: iMac keyboard suddenly isn't working. Mouse

Verify that the OS is working properly by plugging in a different USB keyboard. It doesn't have to be Apple brand; the Windoze key sends the same code as the Apple/Command key.
The most likely cause of a keyboard failure besides contamination or key breakage is a bad cable. It is possible that the encoder board inside the keyboard has failed; this is probably not practical to fix except by cannibalizing another keyboard of the same model.

Posted on Nov 10, 2011

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1 Answer

My imac does not start white screen with a ? mark


reset pram,

try holding down s key to boot in safe mode,


try holding down option key on startup and select drive,


install system disk and restart holding down c key.

Feb 09, 2014 | Apple iMac G4 Desktop

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Four bongs at startup


I believe you are supposed to hear four bongs when you reset PRAM.

Jan 19, 2013 | Apple iMac G5 Desktop

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Keyboard not working


If you were using a bluetooth keyboard, it may still be looking for that keyboard.

Resetting the PRAM may do the trick:
You reset the PRAM by rebooting a Mac and then immediately hold down the Command+Option+P+R keys, you will then hear the Mac reboot sound again, signifying your PRAM has been reset. You must hit the key combination before the grey screen appears otherwise it won't work.

you've tried rebooting, you've reset the PRAM, you've done it all, but your Mac is still behaving strangely. What next? In certain circumstances, resetting your Mac's System Management Controller (SMC) can be a solution. This is sometimes necessary to restore normal lower level system functionality to your Mac.

Here's how to reset the SMC on any type of Mac (and any version of OS X) and the type of problems that it may resolve.
When & Why Reset SMC on a Mac? Some Common Hardware Reasons

Typically it's power and hardware related issues that can be helped or resolved by resetting a Mac SMC, particularly if you're having these types of problems:

* Issues with your Mac's cooling fans and fan management: fans run constantly at high speed, fans run high despite low CPU usage and adequate ventilation, fans not working at all, etc

* Power management and battery problems: Mac isn't turning on, sleep isn't working, random shutdowns and reboots, battery isn't charging, Mac won't wake from sleep etc

* Light problems and improper lighting management: battery indicator lights aren't working, display backlighting isn't adjusting to ambient light changes, keyboard backlights not working, etc

* Video and external displays not working: display brightness functionality not working properly, target video mode isn't working properly, external display isn't working, etc

* General performance and functionality problems: abnormally sluggish behavior despite no CPU or disk usage, external ports not working, airport & bluetooth aren't showing up, external devices are not being found, etc

So now that you've concluded you need to reset your SMC (Note that the SMC is on Intel Mac's only), here's how to do it on MacBook's, MacBook Pro's, iMac's, Mac Mini's, and Mac Pro's. Notice that the reset instructions are different for MacBook and MacBook Pro's if you have an internal or detachable battery.
Reset SMC of a MacBook Air, MacBook Pro Retina, or MacBook Pro's with an internal non-removable battery

This is how to reset SMC on most modern Mac laptops:

Shutdown your MacBook Air / MacBook Pro
Connect the power adapter to your Mac
On the MacBook/Pro's keyboard, hold down the Shift+Control+Option keys and the Power button at the same time
Release all keys and the power button at the same time
Boot your Mac as usual

Here's the key sequence to hold down:

Reset the SMC of a MacBook Air or Retina MacBook Pro

Do keep in mind that by resetting the SMC you will lose power specific settings, like the time it takes to sleep a Mac and other customizations to power settings. No big deal, but if you have made many changes to your hardware behavior you will want to adjust stuff like sleep behavior again.
Reset SMC of an iMac, Mac Pro, Mac Mini

Resetting SMC is different for non-portable Macs:

Shut down your Mac
Disconnect the power cord
Press and hold the Mac's power button for 5 seconds
Release the button
Reattach the power cables and boot the Mac as usual

Reset the SMC of a MacBook or MacBook Pro's with detachable batteries

mac reset the smc Older MacBook laptops with a removable battery can reset SMC with the following approach:

Shutdown the MacBook/Pro and remove the battery
Disconnect the power adapter, hold the Power Key for 10 seconds
Release the power key and reconnect your battery and power adapter
Turn your Mac on
Let boot as usual

Hopefully that will clear up your problems, if not it might be worth a visit to the Apple Store or a certified repair center.

Happy New Year,
Kerry

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if it's bluetooth, are the batteries ok and is it showing up in your bluetooth settings? if it's wired, try another usb port

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You should be able to resolve this by restting your SMC and THEN resetting your PRAM. First:

http://support.apple.com/kb/HT3964

...and then:

http://support.apple.com/kb/ht1379

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You must remove the back panel and press the pushbutton on the motherboard by the 3 leds. If that does not work then you may have the dreaded power supply or capacitor failure. Search the web and youll understand. There are some fix it web sites but if you still have applcare take it in to a apple store and they may repair or even replace the unit.

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Try recording in PhotoBooth or GarageBand.
-=/ MLF /=-

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If you can find an older SVGA monitor, try hooking it up to the port on the back of your mac. If you get video then chances are the LCD display is shot.

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G5 has insomnia won't stay in the sleep mode


Usually this is caused by a USB printer unnecessarily clamoring for attention.
Disconnect ALL your USB devices and the problem ought to go away. Then connect them one by one to find out which the culprit is.
To zap PRAM, shut down the Mac, then push the start button and immediately hold down Command-Option-P-R until you hear the chimes pass by three times. But I don't think this will affect your problem.

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