Sparks when plugging in a USB plug

I removed a USB plug from the back of my iMac to allow me to plug in my Camera USB card reader, and as the metal part of each plug touched the metal case of the iMac, there were several small sparks. My machine is connected to Earth via the mains plug. Sparks near electronic stuff is not good.
Any ideas please?
iMac 21.5", Mid 2011, OS 10.7.1 No unusual peripherals.

Sounds like you have a bad ground somewhere.

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[LENOVE G460] Stuck at Lenovo Logo Screen when a Boot-able USB plugged in

The subject says it all.
I was thinking of doing a Live Install of a Linux Distribution using a Bootable USB.
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But even after a few minutes the screen doesn't even budge from the Lenovo Logo... It just says "Entering Setup..."
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Hi Warnbroom,
Welcome to Lenovo Community!
As per the query we understood that you are facing issue with system stuck at Lenovo logo in your Lenovo H500s laptop.
Try to remove the hard drive(HDD) and check for the issue if the system is able to boot to BIOS.
Hope this helps. Do post back if issue persists!
Best regards,
Ashwin.S
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When I plugged my iPhone into my USB plug it would sync my phone to the computer. It doesn't do it anymore. I removed iTunes and tried to re-download but i keep getting error msgsmsvcr80.dll was not found, windowns error 126, iTunes service Apple Mobile

When I originally downloaded iTunes my iPhone would sync to my computer when I connected the USB plug. Now it won't do it. I removed iTunes from my computer and have attempted to re download iTunes to no avail. I get several error msgs during the download: msvcr80.dll was not found; iTunes was not installed correctly, error 7; Windows error 126; Service 'Apple Mobile Device' (Apple Mobile Device failed to start)
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The following Knowledge Base article provides some great information for troubleshooting your issue. Keep in mind uninstalling and reinstalling has to be done in a very specific fashion, therefore use the guidelines from this article to accomplish this:
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Left USB Sparking when plugged in.

Hi there,
The left side USB on my PB has started sparking when I plug a usb cable in. It feels magnatized when it does, and at the exact same time my power plug turns off (ie the yellow or orange light turns off and the power stops working.). The USB then doesn't work and I have to wait about 10 minutes before putting the power back in and it starts working again.
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Rhys Stephens

I don't know about the magnetized feel, but either one of the pins in the USB connector is bent up or there's something wrong with the board that the left USB connection sits on. Your best bet would be to have it looked at by your nearest Apple repair center (if it's under warranty)
Dan Kennedy
techrestore.com
"Help Is On The Way"
(I work for TechRestore, a business that does repairs on mostly Apple laptops)
Hi there,
The left side USB on my PB has started sparking when
I plug a usb cable in. It feels magnatized when it
does, and at the exact same time my power plug turns
off (ie the yellow or orange light turns off and the
power stops working.). The USB then doesn't work and
I have to wait about 10 minutes before putting the
power back in and it starts working again.
The USB on the right side does not do it, and works
fine.
Could someone please help me.
Regards.
Rhys Stephens
PowerBook G4 Mac OS X (10.4.3)
Message was edited by: DanielK

How do I sync my iPhone 5 to my new PC? iTunes will not recognize it even when plugged in the USB port. Settings General iTunes wifi sync is still my old laptop. Any help is appreciated.

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See also Recover your iTunes library from your iPod or iOS device.
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You will need to restore.
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Creative Cloud Crashes When I Plug In a USB Drive

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Dave,
Thanks for your reply. After four very lengthy tech support chat sessions, the last tech support person (30 July, 2013) suggested that it was probably some sort of conflict with the drivers for the USB ports on my Dell computer. The case number you requested is still open and is: 0184509373.
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You can sync your iPod with multiple computers, but what can be synced is very limited. See this article for more details.
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B-rock

IPhone 3G not appearing in either iPhoto or iTunes when plugged in via USB

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Tried different USB cables.
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Nothing. Including no charging.
Looks like a problem with the USB connections on the Powerbook with the circuitry that connects to an iPhone. The keyboard works fine in either of the USB ports. And the USB ports on my 20" screen that connect to at least some of my external drives also seem to be working. They appear on my desktop.
Is the internal circuitry on the Powerbook USB ports such that some external devices can remain supported while other USB devices are not recognized?
Steve

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Assign your iPod the letter "M" "N", "O" or the like (further along in the alphabet).
For more details, see this article:
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I hope that helps you.
-Kylene
If any post helps or solves your problem, please click the "Solved" or "Helpful" buttons on top of that post. Thank you for helping the boards!

Sparks when plugging into wall

Has anyone else ever noticed that the Powerbook AC adapter tends to spark when plugging it into the wall? Every now and then when plugging it in you will see and hear a spark pop right between the prongs and the wall outlet. Both of my Powerbooks have done this off and on since I got my first one a couple years ago. Not really a problem, just always kinda wondered why it does this. Anyone know the answer?

My experience with the adapter didn't go as well as the rest of you... A few weeks ago those harmless sparks fired my PowerBook. There was a ground in the adapter that would often prevent charging but that day it did more. there was a larger than normal spark and then a humming coming from the connection to the computer. when i tried to turn it on nothing happened even with 30% battery.
Anyway, when I got it back from repair they had replaced the motherboard, sound card and battery. Suprisingly Apple didn't replace my adapter, I had to call and remind them why they did all the work in the first place. The new adapter doesn't spark (yet).
Moral of the story; never connect the power cord to your computer before pluging it into the socket. My 2 cents.

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I am using a MacBook Air 13", late 2010 version.

Have you tried plugging the flash drive into a different Mac to see if it works? The Air shouldn't have any problem with it, I use a couple of flash drives in mine, although I don't have a pq1. Did you try both USB ports on the Air? Do you have another flash drive you can test in the Air, or a different USB device, like a hard drive or printer?
The only thing I can think of is either a bad flash drive, or a bad USB port on the Air. Sorry, can't be more help than that.

Sparks when plugging in a USB plug

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