Left USB port only works when entering BIOS

Hi all -- I have a Toshiba Satellite C855D-S5106, the LEFT USB port only works when I enter the BIOS at boot-time. If I disconnect the drive, i.e. eject it and then remove it, the port stops working. The other two ports at the right work fine. I've tested this with known good flash drives and Kensington USB trackball that work fine on four other computers, and the other two USB ports. I'm thinking its software/BIOS because hardware would fail intermittently, I could not get the port to work if there was a failing connection. As stated, this work-around succeeds EVERY time. I have not upgraded the bios. Has anyone had this problem?

If you can't solve your issue and no one in the community can help, contact support to speak with a tech support agent at (800) 457-7777.
- Peter

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I'm having the same problem. Installed windows 7 professional over windows 7 home preminu.
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This question was solved.
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Thank you, solved!

USB ports only working intermittently

I have an MSI Z97 gaming 7 motherboard, the USB ports on the motherboard only work intermittently, MSI support have suggested I upgrade to the latest bios, which I believe is MS7916IMS.172 and they have sent me a link for this, however I want to use the forum flash tool this is what I used to flash from 1.1 to 1.5 and was very easy to do, could someone give me the correct link to this bios that uses the forum flash tool, I have seen this in posts made by Svet and other forum members for other bios
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My USB ports only work if i unplug them, swap them around and plug them back in. Its driving me crazy! I have done a pram and smc reset, reinstalled lion and spent two hours on the phone to apple. Now what?!!

I have a optical lead coming out of the headphone jack in to a dac that goes in to my amp (which has speakers connected) so i can listen to music. The Dac is powered by usb. Recently the sound stopped working. I called tech support and they suggested the resets (pram and smc) and i reinstalled lion and reinstalled itunes, deleted audio files, blah blah blah.
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I don't know why that happens, since I don't own products of this type... However, if the sole purpose of the USB connection is to provide power (not a data connection), can you connect it to something that just provides power, such as a USB power adapter (like the one that comes with iPhone)?
http://store.apple.com/us/product/MD810LL/A/apple-5w-usb-power-adaptor
Or, if it needs to be connected to a USB port, it might work properly if you get a self-powered USB hub and connect the USB cable to the DAC to the hub. The hub would act like a "buffer" between the DAC and iMac. It needs to be "self-powered" (comes with its own power supply). Here's one such USB hub
http://eshop.macsales.com/item/Newer%20Technology/USB2HB7PRO/
Do you have anything else connected to USB (other than standard keyboard and mouse)? If so, have you tried it with ONLY the DAC connected, to see if the problem recurs? USB devices can interfere with each other.

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Quote from: Nidhogg on 28-February-08, 03:29:28
I've just replaced the MB, CPU, RAM sticks, video card and PSU after the previous MB died on me last week. The problem I've been having is that my mouse and keyboard (they're both USB) stop working as soon as Windows starts loading. They're both functioning during the boot sequence. USB controllers and USB Legacy Support are both enabled in BIOS. I've tried plugging in my old ps/2 keyboard but that one won't work either once Windows has started loading (although it just struck me that it's possible I accidentally plugged it into the mouse port). Any advice on how to resolve this issue would be greatly appreciated.
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If you can't solve your issue and no one in the community can help, contact support to speak with a tech support agent at (800) 457-7777.
- Peter

8520 curve usb port only working with live battery

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If anyone has been helpful to you, please show your appreciation by clicking the button inside of their post. Please click here and read, along with the threads to which it links, for helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions.
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I updated to 10.4.7 and now my left USB port doesn't work

Hi all,
I ran Software Update just a second ago, installing an update to MacOS (PowerPC), ITunes, and QuickTime. After the install and the restart, my left USB port is no longer working. It was working immediately before the install.
I have verified that the peripheral that was not working in the left port works just fine in the right one. I have also confirmed that a peripheral that was working previously in the right USB port doesn't work when attached to the left one.
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Welcome to the Apple discussions.
I would reset your power management unit, then install the combo 10.4.7 update. Recently, there have been issues with updates through the software update function.
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Audio output and left USB port is not working!

Hi! I have MacBook Air 13" late 2010, Audio output and left USB port is not working!
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Part No.: Z0JH000TE RS

If the left USB port doesnt work with an external mouse its seems to be a hardware malfunction of this USB port.
The newest BIOS is already installed?
Have you removed all USB ports from device manager and restarted your notebook?
If you have already tried this, contact an authorized service provider. The guys can try to fix this issue and it should be covered by warranty, if you still have warranty on this notebook. :)

USB-Hub not working on LEFT USB port?

Hello,
I have installed Windows 7 Ultimate 64 Bit on my MacBook Pro 13" Retina (Early 2013) and it's running fine. Boot Camp version: 5.0.5033.
But I have one problem: I bought an external monitor (Dell U2414H) which has an built-in 4-Port USB 3.0 hub. So I connect the Dell monitor using a DisplayPort 1.2a cable and an USB 3.0 cable. But Windows only recognizes the monitor's built-in USB hub when I plug the USB cable into the right USB port (when I sit in front of the MacBook). Then it works without problems. But when I plug the USB cable into the left USB port of the MacBook Windows only says "USB device not recognized". But other devices like USB sticks and USB drives also work without problems on left and right USB port of the MacBook. Also when I boot in OS 10.9 Mavericks the monitor's USB hub is working on both USB ports of the MacBook. So I think it isn't a hardware failure. I also re-installed Windows, but I have still the same problem.
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Is Boot Camp 5.0.5033 the most current version? I checked the box to download the latest Windows support software and also didn't find anything newer than 5.0.5033 to download, but sometimes I read about 5.1.1 - but where could I download it? AND: Doest it help?
Thanks in advance!

I think I've hit a variation on the problem you're enoucntering. I have a late-2013 13-inch Macbook Pro Retina. I've just installed Boot Camp and a copy of Windows 7 Pro. This is my first experience with Boot Camp and Windows on a Mac, so I'm in foreign teritory.
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Note that after reading your post, I did try the hub in both right and left USB ports and that made no difference in my case. I do have one more hub to try (built into my Dell monitor). I'll report back if that happens to work.

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Hello,
My new late 2013 13" Retina MacBook Pro can only charge my iPad 3 (30-pin connector) from the left-hand USB port. Using the right-hand port, USB connectivity works but the "Not charging" message appears.
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Cheers

OK, I messed around with this issue over the weekend. Here's what I did:
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4. Tried plugging in my iPhone 4s into same cable on left USB port, no problem.
5. Replug iPhone into right side USB....again no problem, all behaving well.
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Hope this helps someone else with this problem.

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Hi,
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Try resetting the PRAM:
http://docs.info.apple.com/article.html?artnum=2238
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A restart will clear a hung USB port usually.

Left USB port only works when entering BIOS

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