Is USB port powered when device is ejected?

I have several battery-powered USB devices, such as iPod Touch, that get their battery charge from the computer. If I eject the device from the desktop, will they continue to receive a charge?

Unmounted but still connected - they will draw a charge until the battery is full.

Similar Messages

Keep USB ports powered when PC off

Hi,
I got my first iMac a few days ago and am missing a feature that my PC had. I have a razor mamba wireless mouse that charges in its own dock via USB. I would also like to charge my iPhone 4 from my iMacs USB ports over night. But when I turn off my iMac the USB ports power down, unlike my PC where the USB ports would remain active and charge my mouse over night.
Is there any way I can charge my USB components overnight without leaving the iMac on?

Hi AlmightySi
Welcome to Apple Discussions
A Self-powered USB Hub or Computer Sleep, an iMac can sleep 24-7 for weeks without a problem.
Dennis

HT2188 i just upgraded my iphone 3gs to ios 6 not sure if it updated but now when i turn on my phone it says automatically that i need to connect it to itunes using the USB port but when i connect it it comes up as new hardware and cannot find a program/s

i just upgraded my iphone 3gs to ios 6 not sure if it updated but now when i turn on my phone it says automatically that i need to connect it to itunes using the USB port but when i connect it it comes up as new hardware and cannot find a program/software for my device even though i have the latest itunes on my computer. i have tried reinstalling itunes but it still cannot find my phone and now i cannot use my phone as it is stuck on the sync to itunes screen

Have you downloaded and installed the latest version of iTunes from here:
http://www.apple.com/itunes/download/

My problem is that one of the USB ports and the device does not detect this and inactive but can not find how to reactivate.Help me please! greetings thanks!

Hello good evening, I have a MacBook Pro and my problem is that one of the USB ports and the device does not detect this and inactive but can not find how to reactivate.
Help me please! greetings thanks!

Do you have the Firefox new tab page but the actual sites are missing, or do you have some other page?
If you have some different page, try the quick fix in Fred McD's reply.
If the sites are missing, did you use the Reset feature? That will clear the storage associated with the new tab page. I'm not sure it's possible to recover from that; you probably need to rebuild your page from scratch as you browse.
For possible future reference, here is how to access the hidden setting for the page to display on new tabs:
(1) In a new tab, type or paste '''about:config''' in the address bar and press Enter. Click the button promising to be careful.
(2) In the search box above the list, type or paste '''newtab''' and pause while the list is filtered
(3) Double-click the '''browser.newtab.url''' preference and enter your preferred page:
* ''Page thumbnails (default)'' => about:newtab
* ''Blank tab'' => about:blank
* ''Built-in Firefox home page'' => about:home
* ''Any other page'' => full URL to the page
Press Ctrl+t to open a new tab and verify that it worked. Fixed?
Some gotchas:
''If Firefox won't let you edit this setting:'' you may have something called SearchProtect on your system.
''If Firefox lets you save your change but ignores it:'' one of your extensions may be overriding it. You can review, disable, and/or remove extensions on the add-ons page:
"3-bar" menu button (or Tools menu) > Add-ons > ''in the left column click'' Extensions
''If the change works during your session, but at the next startup is back to an unwanted page:'' you might have a user.js file in your personal Firefox settings folder (your Firefox profile folder). This article describes how to track down and remove the file: [[How to fix preferences that won't save]].
Any luck?

HP DV6c63sl USB ports problem, (Unknown Device)..

Hello,
I have a problem with my USB ports, when I connect my phone with it's USB cable, it's shown as "Unknow Device" and that's just in my laptop.. My other laptop and Desktop PC can detect it without any problem or drivers, and I have the same exact OS ( Windows 7 x64 Ultimate ) on my 3 PCs.
I have the same problem with a Game Controller (PowerPad), it works on all the PCs I've tried it on except my HP DV6c63sl. There's just my USB Mouse that works fine, and almost all other USB devices that I've tried are detected as "Unknow Device", And I've got also a "SM Bus Controller" shown in the "Device Manager window" -when I plug in my USB Game Controller- as undetected, I don't know what it is..
Here's some screens that I think they would help to identify my problem :
& Thank you very much for your help !
I really wants my Laptop to detect all the USB devices like my others PCs ( I'm talking about USB mouses, keyboards, game pads, phones with USB cables.. that get detected automatically without installing any drivers )

Hello Huntrz,
I understand you are having issues with your Windows 7 not recognising a USB device when it is plugged in. I stumbled across a thread on social.technet.microsoft.com titled USB Device Not Recognized on Windows 7 - USB mouse where they discuss a solution that resolved their issue. Now I know your mouse works, but the point is that a USB device should automatically install that is the whole purpose or USB on a computer devices are to be plug and play. Anyways, what they discuss is that what is called a Hard Reset resolved their issue. I am providing you with an HP Support document: Performing a Hard Reset or Forced Reset that will walk you through the steps to performing a Hard Reset on your Notebook.
Please re-post with the results as I am curious as well. Thank you for posting this issue on the HP Forums. Have a great day!
Please click the "Thumbs Up" on the bottom right of this post to say thank you if you appreciate the support I provide!
Also be sure to mark my post as “Accept as Solution" if you feel my post solved your issue, it will help others who face the same challenge find the same solution.
Dunidar
I work on behalf of HP
Find out a bit more about me by checking out my profile!
"Customers don’t expect you to be perfect. They do expect you to fix things when they go wrong." ~ Donald Porter

I just bought a new portable battery. It uses 2 USB ports to charge devices, a 1 amp port and a 2 amp port. My question is which port do I plug my iPhone 5s into and which do I use for my iPad 2?

It's a 10,000 mAh external battery. I got this for traveling and because I go to disneyland a lot. My phone wont last all day there and unlike some people, I would never plug my phone into their outlets (I watched a girls phone spark and practically melt once), their voltage is way too high. I have other batteries, but when I saw that this one can charge the 5s fully 3-5 times, I new it was a must. Online, there were wonderful reviews about it and that it charges the 5s and the iPad 2 wonderfully. However when I opened the package and read the directions it listed that there were 2 USB ports, a 1 amp and a 2 amp and to match your device to the port. Now it's been a while since I've studied about volts, amps, etc. so the first thing I do is google it. I know that the iPhone 5s uses 1 amp and the iPad 2 uses 2 amps, and from what I read, you can use the iPad charger to charge the iPhone (which I didn't know there were conflicts about this, I've always used my iPad charger for my phone). There are a lot of articles with people going back and forth about charging techniques, but I want to make sure I'm not going to damage any of my devices if I plug it into the wrong port.
Any responses will be appreciated as this isn't an area where I am very knowledgeable! Thank you!!!

The iPhone and iPad draw whatever charging current they require. The iPad draws more.

ENVY 14 USB Not Powered when computer asleep

I recently had to change hard drives on my ENVY14. After reinstalling the drivers off the HP website, I am no longer able to get power to the USB ports when the computer is off or in standby mode(computer is on AC power). This no longer allows me to charge devices via usb or wake the computer from sleep using the mouse. There doesnt seem to be any bios option for this. And Ive tried different power settings and looked at the options for the USB hub within Device Manager. Any input would be appreciated.

@lagrit1023 ,
Hello and thank you for posting on the HP support forums. What you may have happening here is a problem with the power regulation on the motherboard or an issue with not enough amps from the power supply.
Can you try the power supply on another notebook or have someplace you can take it to be checked?
The only other way to check this if you have already done the battery checks and so on is to get the system sent in for repair. For this you will have to contact HP phone support.
Please call our technical support at 800-474-6836. If you live outside the US/Canada Region, please click the link below to get the support number for your region.
http://www8.hp.com/us/en/contact-hp/ww-phone-assist.html
Please let me know how things go.
Thank you again for posting and have a great day.
Please click the "Thumbs Up" on the bottom right of this post to say thank you if you appreciate the support I provide!
Also be sure to mark my post as “Accept as Solution" if you feel my post solved your issue, it will help others who face the same challenge find the same solution.
D5GR
I work on behalf of HP

Lion and USB ports and flash devices

I noticed a curious thing today, when endeavouring to update my NavMan satnav via Parallels 6/ Win XP and USB under Lion. Basically, the satnav (which has internal flash memory) isn't recognised by the NavDesk software, WinXP or Parallels.
Booting the iMac back into my SL clone, all works as expected - the device is recognised by WinXP and communicates. It also mounts the flash drive on the Mac desktop until it's captured by Parallels.
Booting the iMac back into Lion, same Parallels pvm, the device doesn't mount on the Mac desktop, and is not detected by Parallels/WinXP.
So I look into it further: in Lion, under 'About this Mac', the device does NOT show up under USB hubs, on any of the USB ports on the iMac. However, if I attach the satnav to my standard Apple wired keyboard, it IS recognised on the keyboard hub, but still doesn't mount, or is able to be detected by Parallels. I should mention that I also tested this out with other flash drives, which performed as expected, and on another iMac running Lion that also did not recognise or mount the drive.
Not quite sure what to make of all this: works OK under SL, but not under Lion on the same hardware, so it would seem to be a USB driver issue, with Lion not playing nice with what is still a current-shipping third-party device and rendering it incompatible.

I'm not sure I totally agree about Parallels 7.
From the actual Parallels website:
http://www.parallels.com/au/support/pdfm6/
"Parallels worked closely with Apple during the development of its Lion operating system. Our testing has shown that the latest built of PDFM6 supports Lion but does not take advantage of new Lion features."
If you do a little digging, there suuposed advantages of 7 over 6 might not be worth the upgrade cost for some. I'm not really interested in Parallels using the new Lion features like 'enhanced full screen support', new gestures and mission control interface, AES-NI encryption and Mac-on-Mac virtualisation.
I would recommend anyone debating the issue have a Google around and also read the following link, at the end of the day for me the $50 buck upgrade isn't worth it and I will wait for Mountain Lion (OS X 10.8) and the eventual Parallels 8 before I need an upgrade.
http://www.infoworld.com/d/virtualization/parallels-desktop-7-mac-upgrade-you-ca n-skip-172055

USB port issues when using iphone5

I have recently upgraded to an iphone 5 but whn I connect to my imac (intel/2009) I get error message up saying the usb port is being disabled as the device is drawing too much power. This means i cannot charge the phone from the imac nor connect to itunes. Has oneone else had this issue? can anyone suggest how I can resolve it.
cheers

I'm not sure how the issue can be resolved but I'm having the exact same problem when I try and charge my iPhone5 on both my macbook pro at home and at work. I have no other usb devices in use when this happens and I cannot find a way to rectify it so you're definitely not alone.

USB Port not detecting device

My usb port on the side of the pc both are not detecting any device. How to fix it?

A good place to start troubleshooting is this HP document, Troubleshooting USB Connections (Windows 7).
If you don't have Windows 7 or if you have further problems, please to provide more information when you post again. The more information you provide, the more likely it is that you'll find someone here to help you.
Welcome to the forum,
GeorgeFN
GeorgeFN
I work on behalf of HP.

USB Ports - Mass Storage Devices - Unknown Device

Model: Satellite A135-S2276
OS: Vista
I recently tried plugging in my media card reader that I've had for several years now and has worked many dozens of times. Windows responded with an 'Unknown Device' response. I thought this was odd, so I changed and tried each USB port. To no avail the device wasn't recognized. I tried it in another computer and it worked fine.
I began to try two other mass storage devices that I know used to work, up until recently, on the laptop. Both now are 'Unknown Devices'. I now have a strong feeling that someting was wrong with windows vista. So I search around and find methods to force the driver (inf) cache to reset which should reload any corrupted drivers. Tried many methods, nothing worked, same results. I saw that Vista Service Pack 2 just came out, I installed that hoping that it would fix. Nope.
I gave up on it being a software issue after I did a fresh reinstall of the OS and with the base OS with no other software installed same results.
Is there a way to diagnose if the USB is malfunctioning from a hardware standpoint? Is it possible the USB, even thought windows recognizes it, is dead on the motherobard? If so, how do I get this fixed? Motherboard replacement?
Help!!

It sounds like it is working enough that it can recognize that soemthign is plugged into it.
You say you did a fresh install of Windows. Did you use the recovery disk or a retail Windows copy. If oyu didn't use the recovery disk then maybe you are missing a driver. Best woudl be to use the recovery disk. If a USB mouse doesn't work after that then the hardware has an issue. Assuming the BIOS is OK.
This signature left intentionally blank.

TS1538 On Windows Vista, everything works through the USB ports except IOS devices. This just started and I can't get things to work. Help!

The past few days I find my IOS devices don't show up in "My Computer" and they don't show up in iTunes. All other USB devices work well. I am using Windows Vista. I have tried several troubleshooting things, including unintalling and reinstalling iTunes, stopping and starting the Apple monitors, etc. Nothing is working. Ideas?

It's really great that you're taking the time to help me. I did several of the tests you recommend over the last two or three days. It always shows that the iPod/iPhone/iPad isn't present. Here's more. I got a Norton tech to help me yesterday and it isn't the anti-virus, as we uninstalled everything and it still didn't work. I went deeper into the system through the control panel, and found the device detected on the appropriate USB port, but it won't show up in "My Computer". Two of the three devices show up on another PC, (I didn't test the third) so I'm leaning to something in iTunes because every other USB device I plug into the Vista ports shows up quickly and works perfectly (thumb drives, wireless mouse, camera, etc). I already unistalled all Apple software and downloaded new, but the problem still exists. I have restarted, unplugged, you name it and the devices aren't showing up. I can't wirelessly sync either because one has to set that up through iTunes prior to doing it.

Splitting the Time Capsule USB port for 2 devices ??

So if i have and external HD plugged into tc usb port and I also need to plug in a netflix ready blue ray player to the same port- is there a splitter I can buy to do this or what other options do i have?
I have an extra airport extreme I am not using-could I run an ethernet cord to it and use that usb port for my second device without and problems?
Thx

First, yes it is possible to attach multiple devices to the TC's USB port. You will need a USB hub though. Some users have discovered that not all hubs are compatible with the TCs USB port. So you may need to shop around if the first one doesn't work.
However, the USB port on the TC is designed primarily to handle external HDs or printers. That is, it is designed to make them available to your local network, not to the internet. So I have doubts that the BR player will be able to have full interest access via the TCs USB port.
See this KB article:
http://support.apple.com/kb/HT2421
Hope this clarifies things a bit. Cheers!

I am trying to communicate with third party instrument via usb but I dont know how to do it even in Ni-max I am not able to see usb port symbol in Devices and Interface section.

hello,
I am tring to communicate my Powersupply which is not from Ni via USB cable ,but I am not able to see my connection or usb symbole in Ni-max .
first time I am using this will you please guide me,and is there any driver i need to download for that?here I put one attachment regarding to this.
Thanks in advance.
Solved!
Go to Solution.
Attachments:
usb is not detected.png ‏182 KB

ya I know that,
thats y i asked you that y it is so because i am not able to see that usb port here i can see that much only.
thats y i got confused.
and I can see my hameg connection in my control panel and also in device manager.
http://www.hameg.com/drivers.0.html?&no_cache=1
this is website for hameg driver in that product select hmp4040 than hmp4000 list will open in that i have download third one in which plug and play is given.
or here i send my vi it might be helpful.
Attachments:
hmp4040 Output DC Volts.vi ‏17 KB

Thinkpad W530: None of the USB ports work when used with a 4338-35U replicator

I have tried mouse. keyboard and a generic USB stick with a LED. None of the USB ports work on the replicator. Everything works fine when connected directly to the W530. The replicator ports must not have power because the LED doesn't come on.

Hi mmjmm123,
How long have you had your replicator?
Has it always been like this?
This link is to the Lenovo User's Guide for replicators:
http://download.lenovo.com/pccbbs/mobiles/43r8770_users_guide.pdf
Scroll to Chapter 5 for troubleshooting procedures.
Replicators do have limitations which can be found here:
http://support.lenovo.com/en_US/detail.page?LegacyDocID=MIGR-69755
Check these sources and let us know how it works for you so we can share the knowledge.
Enjoy your day!
Be AWESOME Everyday!
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Is USB port powered when device is ejected?

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