USB Power Issue

Suddenly my MacBook Pro won't charge my iPhone. It says there isn't enough power:
"Because a USB device was drawing too much power from your computer, one or more of your USB devices have been disabled."
I get that message even when there is NOTHING connected to the USB cable when I plug it in.
It is allowing me to continue to use a Kensington Expert Mouse corded trackball.

For power issues anywhere, perform an SMC Reset.

Similar Messages

After Software Update, USB Power Issues and Cursor Freezing

I have a 1.8 dual g5. After the latest software update I experienced some seriously quirky usb power fluctuations, a card reader frying and sudden, but temporary, mouse cursor freezing. I did some research and went for a clean install from original Leopard disc and downloaded the combo update 10.5.2 from apple support. I then restarted in "safe mode" and ran the 10.5.2 update, restarted, zapped the pram, restarted to disc warrior to repair permissions and clean the drive... then restarted again. Same deal: Spinning lines on gray 1-2 minute. black (sometimes white) screen 3-5 minutes. blue screen 1-2 minutes. log in.
Tried cocktail, disc utility permission repair and removing log-in applications/drivers. Same deal... ****** computing. I feel like it's 1999 all over again.
Cost me three full days work so far under a very tight deadline and a lot of stress..... Apple is 100% responsible for this messy release and needs to address it quickly.

My problem is similar to the others already posted, but quite different too. Perhaps someone else has had this strange issue occur. I attach my nike+ receiver and set my workout as usual, and then I come to selecting playlists. I select my playlist (which is titled running) and my work out starts. HOWEVER, the playlist that I selected plays music from another playlist such as sarah mclachlan (which is not in my running playlist). I have tried everything that you guys already posted short of doing a restore. Any thoughts? I posted this same question on the nikeplus.com web forum but no one has replied. I can find no sequence to the playlist malfunction. For example say I choose to play my sarah mclachlan playlist it will play my irish playlist instead and so forth. Make sense? HELP!!!!!

2012 MacMini and iPad 4 - Low USB Power Issue

I have a freshly installed 2012 MacMini that I am trying to set up WiFi Sync on a new iPad 4 but I keep getting a low power on USB warning when I plug it in. Is anyone else having this problem? All that I have plugged into the MacMini is a HP DeskJet 4140 and in another port the Apple Aluminum Keyboard (with Apple Mouse plugged into one of the keyboard ports). I would have thought that the Mini would be able to handle this with no problems.

Great news, thanks for the report!

Mavericks usb power issue?

I upgraded to Mavericks on my 2008 Unibody Macbook (2ghz Intel Core 2 Duo - 4Gb) - and then updated to the latest version of Garageband. I have an iRig HD which has been working fine since I bought it a few weeks ago and seemed to work ok for about 10 minutes in the updated Garageband then I got the message "Audio device has been disconnected".
Now everytime I connect it it either works for about 30 seconds and then gives me the same message or it doesn't even register that I've plugged it in at all.
I have reset the SMC but the problem is still persisting.
Has anybody else had a similar issue with USB devices in Mavericks? Any suggestions on a fix or help on how to roll back Mavericks at all?
Thanks in advance and have a good evening.

Hello Stuart,
Thank you for the details of the issue you are experiencing with your iRig HD. You have taken some good steps to troubleshoot this issue, but I found an article with some additional steps you can take when an external device is not being recognized.
I recommend following the steps in the section titled "Top troubleshooting tips" in the following article (you can skip the steps you have already taken):
USB and FireWire Quick Assist
http://support.apple.com/kb/HT1151
Thank you for using Apple Support Communities.
Best,
Sheila M.

Latest iMac: USB power requirements unclear, Microsoft USB game pad stopped working

Hello,
I am sorry that the cut and paste information is in German.
I am a long time Apple iMac user and used the Game Pad since years with no USB power issues.
Now, I have just received my late 2014 iMac with Maverick OS X.
Hardware-Übersicht:
Modellname: iMac
Modell-Identifizierung: iMac15,1
Prozessortyp: Intel Core i7
Prozessorgeschwindigkeit: 4 GHz
Anzahl der Prozessoren: 1
Gesamtanzahl der Kerne: 4
L2-Cache (pro Kern): 256 KB
L3-Cache: 8 MB
Speicher: 16 GB
Boot-ROM-Version: IM151.0207.B00
SMC-Version (System): 2.23f11
Ever since, I cannot use my Microsoft USB Game Controller any more.
Controller:
Produkt-ID: 0x028e
Hersteller-ID: 0x045e (Microsoft Corporation)
Version: 1.14
Seriennummer: 075841A
Geschwindigkeit: Bis zu 12 MBit/s
Hersteller: ©Microsoft Corporation
Standort-ID: 0x14600000 / 16
Verfügbare Stromstärke (mA): 500
Erforderliche Stromstärke (mA): Unbekannt (Gerät wurde nicht konfiguriert) <--- Device unknown, and not configured. The power requirements are unclear.
What can I do to get the USB controller accepted again? I have a 3rd party OS X driver that does work for me. I'd assume, this issue is at the HW layer, during boot-up and initial hand shake, not a SW driver's issue.
Sincerely,
Michael

I guess I should have read the forum first. I zapped the pram and everything seems back to normal. Sorry for not trying this 1st. Issue solved.

Boot Camp 2 issues: repartioning; DVD-drive; screen; sound; usb-power

I found various problems in version 2 of Boot Camp (included in Leopard).
1.
After removing the Boot Camp 2 Windows partition, it is impossible to recreate a new Windows partition. Somehow the windows partition is not completely removed (?) and the Boot Camp Assistent goes on forever restoring the Macintosh HD to its original (one partition) state. Strangely, you can just quit the assistant during this process without consequences. Only repartitioning the complete HD using Disk Utility resolves this (this of course requires a complete reinstallation of OS X).
2.
After installation of Windows XP Pro, Windows treats the DVD-drive (OPTIARC DVD RW AD5630-A) as a removable media, just like a USB-memory. This means that you can remove the DVD hardware from the system(using the tray icon "Safe Removal hardware") by just one click. The DVD drive then completely disappears from 'My Computer' even with a CD in! The only way to get the DVD-drive back is by restarting Windows (inserting a disk can be done but it is impossible to access the disk; ejecting the disc is also impossible (the eject key on the mac keyboard doesn't work).
3.
I suspect that there is something wrong with the video driver in windows. This can be noted for instance with the black "moon crater" as the desktop image (lower left corner) or in the windows login-screen (lower blue part of the screen). The issue may be described as pixels varying in brightness and colour in a fast way. Pixels are not "constant" and it seems like a wave is moving over these parts of the screen. It seems more or less comparable to the problems reported with Boot Camp beta 1.4 on MPB's.
4.
I also suspect the windows sound driver (RealTek) not to be ok. Every Windows sound (startup Chime, warning, etc.) is followed by a strange electronic sound, as if the sound is echoing while fading away. I did not try to play an audio CD, but I think this may result in a not so pleasant experience.
5.
When I connect my 2 GB Kingston USB-memory to the internal hub of the new apple keyboard, Windows starts complaining that there is not sufficient power. The same configuration works without problems under Mac OS X.
Has anyone similar experiences? To me it seems like Boot Camp is still in beta stage....

I also encountered problems 4 and 5:
*To no. 4: Distorted sound and background noise:*
It's exactly the same as described by HLO-HL. As soon as the soundcard gets turned on in Vista (by any program i.e. iTunes, Mediaplayer) there is this background noise. Watching a DVD is almost impossible. Listening to music in iTunes is somewhat ok, but only at high volume (so the background noise cannot be heard) and it is still distorted sometimes.
I tried about everything from installing the latetest Realtek driver, updating the Intel chipset drivers, to changing the bitrates and so on. Still no resolution found. It seems the many others experience the same problem (search for 'distorted sound Vista').
*To no. 5: Low USB power reported*
I got this message with every device I connected (no matter if it was a 2.5''-harddrive, a cardreader, a camera or just a simple memory stick ...

My 2007 Macbook pro Intel Core 2 Duo   Processor Speed 2.33 GHz has power issues with one or some of my USB powered devices. Last night I could not back up my Lacie external drives with software SuperDuper, hard drive copier. I also had a message that Tim

My 2007 Macbook pro Intel Core 2 Duo   Processor Speed 2.33 GHz has power issues with one or some of my USB powered devices. Last night I could not back up my Lacie external drives with software SuperDuper, hard drive copier. I also had a message that Time machine failed. I have two powered 12V USB
routers that are plugged into a 550VA CyberPower surge protector. I often receive these insufficient USB power for devices messages a dozen times even when I do not have devices like camera, Ipad, Ipod, and Tascam digital audio recorder plugged in. Is there a way to troubleshoot these USB routers or should I consider that one of the routers may be defective and replace them?
David

My 2007 Macbook pro Intel Core 2 Duo   Processor Speed 2.33 GHz has power issues with one or some of my USB powered devices. Last night I could not back up my Lacie external drives with software SuperDuper, hard drive copier. I also had a message that Time machine failed. I have two powered 12V USB
routers that are plugged into a 550VA CyberPower surge protector. I often receive these insufficient USB power for devices messages a dozen times even when I do not have devices like camera, Ipad, Ipod, and Tascam digital audio recorder plugged in. Is there a way to troubleshoot these USB routers or should I consider that one of the routers may be defective and replace them?
David

HT201569 i am not able to charge my iphone 6 through USB Power Apater till it hits 20% of battery remaining..any issue with iOS8.1.1 or it's usual to iphone

HI ,
I recently bought iPhone 6 & updated to the latest version of iOS 8.1.1. My problem is am not able to charge my phone with USB Power Adapter till my battery % remain to 20%. If it is more than 20% power adapter will not work. But i can charge through my laptop.
Please suggest, how to change the settings.
Thanks
Charu

Hi,
That should not be happening. Maybe you should take it back to where you bought it.
Download and read the User Guide at this site: https://itunes.apple.com/us/book/id917482340
Good luck.

Unable to Troubleshoot Power Issues on Mac mini 2011

I have been having odd and intermittent power issues with my Mac mini 2011 and could really use some help before I resign myself to taking it into an Apple Store. It's under warranty, but I now live in another country so I hope I don't need to ship it should it come down to that.
However, I have searched this topic a lot, and not only have I tried troubleshooting it, I haven't seen any power issues with other owners of this model. That leads me to think that the power supply itself is probably OK.
First of all, I live in China and the building I live in seems to have a questionable power supply. The air conditioner for example simply would not work and the repairman spent two hours messing around with wires inside the outlet and in the breakers. That did the trick, so I wonder if I'm simply not getting enough juice?
Main symptoms:
- My monitor recognizes an analog signal but will not light up (black monitor). Unplugging and replugging adaptor doesn't do anything.
- Startup Keyboard Commands (e.g. Cmmd-R) may work, but I can't tell because the monitor won't light up. Letting the computer boot up though I can hear keyboard volume keys and such making the standard sounds. I can usually restart using the keyboard too.
- My 2T external HD more often than not dismounts as well.
- I can't hear any computer activity after the chime (hard drive, etc.).
- Since I can hear the chime and there is audio feedback through the keyboard, I think that eliminates hardware problems such as logic board failure or bad RAM.
- I can't boot even if I unplug all USB peripherals.
- Holding down the power button (I have it set to make the computer sleep as well as shut down) often won't shut down the computer, but it seems to stay in sleep no matter how long I hold it. Unplugging the computer finally shuts it down, obviously.
- Unplugging and waiting 5 minutes or so and powering up again doesn't seem to make any difference, nor does switching sockets, plugging directly into the wall, etc.
Problems began about two weeks ago, got better, and then worse again. Now I'm just keeping the computer and monitor on (never sleep 24/7).
Miraculously, after much frustration and countless restarts, suddenly the screen will turn on to reveal a fully booted system that was running all along in the background. No startup screen- the monitor just magically comes on again. Often I find that my external has unmounted, but it's no big deal to get to remount. At this stage, the Mac is still very quiet and for a while the system is sluggish, though it hops back into action in 5 or 10 minutes.
At first I thought it was just my monitor, and though that's possible I suppose, it seems I'm just not getting enough juice. Once the monitor is on though, everything is fine: I can power it off and on with no problems. But I can't just leave my computer on forever though.
Any help appreciated.

Well, with the other monitor (which did not work with the mini either but worked fine on a laptop), I was able to narrow the trouble spot down to either a faulty Mini Display to VGA adaptor or a damaged port. I could determine that all the other ports (incld. the USB drive, programs, internet, etc., were all working fine behind the big black GUI all through sound feedback, so I seriously doubted it could be a supply problem or a residential electric problem.
I took my mini and adaptor to a "Mac Shop" (reseller) here in China, and found it quite professional, just like a Mac Store. They tested my machine, and although they didn't have VGA monitors, they said I could return the new $30 USD adaptor if it didn't work. But as I'm writing this on the monitor now, the new adaptor did the trick.
The long and short of all this is that I've read a lot about display problems with the mini and I suspect that most of these problems are adaptor related. I myself tried to save some bucks by buying a third party plug and lived and learned. I hope the Apple adaptor works like a champ, and if it doesn't, I'll know the first thing to eliiminate next time.

IPod Nano (4th Generation) switches on when connected to USB power - shows Menu & hangs (unresponsive to click wheel) - deems off after 5-sec - Switches off after disconnecting from USB Power - syncs with iTunes - Tried 5R's - Problem still persists

1. The iPod Nano (4th Generation - 8GB) switches on, only when connected to USB power by showing apple logo and displays Menu options thereafter..
2. However, I can not access Menu as it is unresponsive to click wheel. As a result it is inaccessible to any further use,
3. NOTE: it displays "Battery Fully charged" icon on the screen without any "Lock" icon.
4. After 5-sec to 10-secs the screen deems off.. i.e. goes to sleep mode.. And thereafter would probably remain like that (sleeeping) for eternity!!!!
5. It Switches off after WITHOUT DISPLAYING any Apple Logo immediately after disconnecting from USB Power.
6. In other words, it can be switched on only through USB power in spite of battery being fully charged.
7. Interestingly, it syncs with iTunes. It is recognised in iTunes (Latest version 11+).. Displays on screen all commands Like.. syncronising, connecting, connected,
8. Allows to add Music, videos like a normal ipod & displays all status information in iTunes.
9. Read Trobleshooting & Tried all 5R's. Registered, Resetted, updated & Restored to iOS 1.0.2
10. It is now displaying to select Language in place of Menu options, with no access through click wheel, centre button whatsoever... Problem still persists
KINDLY GUIDE ME THE SOLUTION. APPRECIATE YOUR RESPONSE in advance...

"I get the feeling that this is a software issue that could probably be solved quite easily"
Since you have already tried all the normal troubleshooting solutions, take the iPod to your nearest Apple Store for a *proper diagnosis.* The staff there will be able to confirm if your problem is software or hardware _*at no cost to you.*_
!http://i50.tinypic.com/izvwo1.gif!

New iPod touch 5th generation charger won't work with computers or USB power adapter?

I just got this charger less than two weeks ago and just yesterday it started saying "This cable or accessory is not certified and may not work on this iPod." It will only work on some occasions, but most of the time it won't. Other times it will show that it is charging, but when I select to "Trust" my computer it stops charging. When I plug it into the USB power adapter, it rarely works (even when I try it in different outlets.) Any way to solve this issue?

If a non-Apple cable and the place will not take it back then:
USB Power Adapter Takeback Program

USB Power adapter for external harddrives..

I found a post regarding this issue but wanted to get more info if anyone else has experienced this problem.
I've a Macally external fire/usb enclosure that powers up and mounts directly on to my PB Aluminum 1.67
laptop but the USB portion doesn't draw power. It simply makes that "clicking" sound.
After trouble shooting with Apple and MacAlly . I digress ..no one in the US service calls now mainly overseas..a
MAJOR drag when communicating (bad reception,etc..)
It was later told to me about the power issue with the aluminum series not drawing enough power for the older
firewire/usb or USB only enclosures.
I was told that I had 2 options:
1) purchase a AC power adapter to run the USB part of the drive
2) get a "USB express" power adapter that connects between the PB and the external HD
I wouldn't fuss over the USB part of this external HD, but I'd like it to work so I can exchange info
between my other firewire/usb drive and the MacAlly firewire/usb simultaneously.
It's a time saver for backing up info between these two drives.
I would like to avoid using an AC adapter just to power the USB part of this drive.
That's why I purchased this drive as it ran off the power from the computer.
Any leads on various "AC free" USB power adapters, or anything like minded DO reply back.
as always thanks in advance.. ~A~
files

Hi, Atcandela.
I've a Macally external fire/usb enclosure that powers up and mounts directly on to my PB Aluminum 1.67 laptop but the USB portion doesn't draw power.
Do you mean it mounts and works OK when connected via FireWire, but not when connected via USB? If so, that's unsurprising. I would be surprised to hear that it doesn't mount when you use the FireWire connnection, because most drives are able to get enough power from that port.
Does MacAlly not offer a cable for your drive that allows it to draw power from both your USB ports? Some manufacturers of external drives or enclosures do offer such a cable, and it's well worth buying because it's much smaller and more portable than an AC adapter. Have a look at this one from Western Digital — it might fill the bill for you.

27" LED display drawing too much USB power?

I'm having the infamous "USB device is drawing too much power" issue, but in my case it's a little different. Whenever I plugin the USB cord from my 27" LED display to the MacBook, it results in the above error (too much power, USB is disabled).
I've narrowed down the following:
1. Happens on two different MacBook Pros.
2. Happens when LED display is powered from different outlets.
3. It seems 2 of the 3 USB ports on the back of the display are not working.
This started happening after I moved about a month ago and reconnected everything, including a USB Hub I was using previously. I also have a SD card reader, all of which was plugged in and ready to go. When I powered up everything, the lights on the Card Reader and USB were actually pulsing, which didn't look right so I immediately powered everything down. Checked all connections and tried again. Same thing happened, so I unplugged the card reader and USB hub.
At this point, I had my keyboard plugged into the monitor which is how it was prior (before my move). I powered up everything again and while waiting for the keyboard to come on (the keys are illuminated), I noticed it was actually VERY hot - the underside of the keyboard. So I unplugged it and had a little bit of a sonofa***** moment. The keyboard seemed fried. It wouldn't come on for anything, so I went and bought a new one.
Soon as I get home, I plugged the new keyboard directly into the laptop and ignored the external LED display. Everything seemed to work fine, so I tried plugging the external monitor in, but soon as I connected the USB cord... this error pops up every single time.
Is this a USB cord issue (on the LED display) or what? I'm at a loss of what could have happened, since when I moved everything was transported very carefully. The LED display was even in it's original retail box, so nothing was damaged in the move, USB cord included.
Any thoughts or suggestions would be appreciated. I know ultimately I may need to bring it in for repair (still within warranty as I purchased the display in May 2011)... but I'm trying this first incase anyone has any ideas that could help me avoid that hassle.

Smc reset sometimes addresses some power issues.
It is possible that when that first keyboard failed when plugged into the back of the display it somehow damaged the display usb ports.
If you are under warrantee, take it to apple and let them deal with it.

New USB Power Adapter includes cable

I just got caught and hope this advice helps others...
The original USB iPod power adapter did NOT include a USB-to-dock cable. I just ordered the NEW USB power adapter and the extra cable. Guess what - it now includes the cable!

Did you find a solution Raf SR?
I have a similar problem. After initial (updating/restoring) issues with my ipod mini which I won't bore you with, I got it working and charging successfully through my PC via the USB cable. Then I bought a USB power adapter for when I am away from my PC. When I connected my ipod to the power adapter it did the brief "do not disconnect" thing then "OK to disconnect" with no attempt to charge. I left it overnight and the following morning it had the battery/triangle/exclamation mark symbol and I had to reset the ipod to get it to work (I did this while still connected to the power adapter).
I borrowed a friend's firewire power adapter and that worked fine. I went back to the store and swapped my usb power adapter for another (firewire power adapter wasn't available) and it did the same as the first one. The ipod still charges fine via the PC and usb cable.
I don't get it! Can anyone help? Thanks
Compaq Windows XP

Fake Apple USB power adaptor advertised as real on amazon?

http://www.amazon.com/Apple-Power-Adapter-iPod-iPhone/dp/B001GQ3DP6/ref=dpob_titlece
Ummm... how can apple(or is amazon to blame?) allow this?? i mean i wouldn't mind if they said usb power adaptor for ipod. Just don't falsely advertise as the real one made by apple.
What do you think? and to whom do I complain :P?

Sounds to me like they are selling adapters they are getting from 3rd party sources (or used) hence the fluctuating prices. Overall reviews are above average and the seller is highly rated. If you have an issue with them you need to take it up with Amazon but there is nothing there Apple would be concerned with.

USB Power Issue

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