Is it safe to use the power adapter without the grounding pin?

Is it safe to use the power adapter without the grounding pin?
Last time I unplugged my power adapter the grounding pin stayed in the wall socket. Is it safe to use it with just the 2 prongs?

Is it safe to use the power adapter without the grounding pin?
No. If a short circuit occurs, it may cause the case of the computer or other device to build up an electric charge. The grounding pin absorbs any charges generated this way; without it, someone touching the device may get shocked.
(52105)

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Is the power adapter in the world travel kit identical with the one in the world travel kit?

I was told that to charge my Ipad2 in Europe I need to buy the world travel adapter kit - with the apple power adapter that looks the same as the one that comes with the Ipad2 - plus the adapter plugs. I do not need any more adapter plugs - have lots of those and multiple ones for Europe. So why am I being told by Apple store people that I must buy the "kit" for $39 when I already have a power adapter that is 110-240 . I can see taking a second power adapter - in case something happens to the original one- but why am I told that the power adapter in the kit is "different"? If so - different in what way?

To follow up: I'd put my apartment number (there are about five hundred at this address) in my address information (or Apple pulled it in with the information that goes with my Apple ID), but the number didn't make it into the shipping label. Calling DHL got the apartment number added, and they will attempt delivery tomorrow.
So calling DHL was the thing to do. I even grudgingly admit that having me make the call provided the information needed to close the case.
Two residual complaints: Apple/DHL should have formatted the address label correctly. And, DHL should have registered a shipping exception, which should have gone to Apple (or me), so I could have been told of the problem two weeks ago.

Using Alu Power Adapter with The new MBP Unibody 2009 ? (Both 85 Watts)

Hi,
Can i use the Power Adapter off my Aluminium MBP 2.5 GHz,15" intel core 2 Duo (MacBookPro4,1), with the new Unibody 15" 2.66 GHz(MacBookPro5,1)?
They are both 85 Watts.
The Power adapter for Aluminium is :
Input : 100-240V - 1,5A 50-60Hz
Output : 16,5-18,5V, 4,6 A Max
Delta Eletronic
The Power Adapter for Unibody is :
Input : 100-240V - 1,5A 50-60Hz
Output : 18,5V 4,6A, 16,5V, 3,6A
LiteOn Technology
Thanks for The Lights.

That's correct, I meant to type 85W.
Can anyone advise what the impact will be of using older 85W adapters with the new MBP's that come with a 60W adapter?
Is there a shorter battery life in the long-term, or is the new battery designed to cope the same with either of these power adapters?

I have a ipod touch 3rd gen that has been working fine until a week ago. I usually charge it using a power adapter in the house or using a car power adaptor. All of a sudden neither will charge my ipod. It does charge is I connect to computer.

I have tried different cords. Other Ipods charge fine. I have rebooted the Ipod. I don't know what else to do.

Hi,
Try resetting your iPod: http://support.apple.com/kb/HT1430.
If that doesn't work, try restoring it: http://support.apple.com/kb/ht1414.
If all else fails, you will have to place your iPod in Recovery Mode: http://support.apple.com/kb/HT1808.
Hope this helps!
---likeabird---

Doesn't recognize the power adapter. Have replaced battery and PRAM.

Howdy,
I'm having a devil of a time with my Powerbook. It won't recognize a power adapter.
It won't charge my battery.
Won't run when plugged into the power adapter.
The only way it works is for me to charge my battery in my girlfriend's Powerbook and then sprint through any work I try to get done.
I've replaced the PRAM with twice. (one i bought and the other I took from my girlfriend's which I 100% know to work) It didn't make a difference.
Below is the info from the system profiler "System Power Settings"
System Power Settings:
AC Power:
System Sleep Timer (Minutes): 10
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 10
Automatic Restart On Power Loss: No
Wake On AC Change: No
Wake On Clamshell Open: Yes
Wake On LAN: Yes
Wake On Modem Ring: Yes
Display Sleep Uses Dim: Yes
Battery Power:
System Sleep Timer (Minutes): 5
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 1
Automatic Restart On Power Loss: No
Wake On AC Change: No
Wake On Clamshell Open: Yes
Wake On Modem Ring: No
Display Sleep Uses Dim: Yes
Reduce Brightness: Yes
Battery Information:
Battery Installed: Yes
First low level warning: No
Full Charge Capacity (mAh): 3734
Remaining Capacity (mAh): 3374
Amperage (mA): -1231
Voltage (mV): 11770
Cycle Count: 235
AC Charger Information:
AC Charger (Watts): 0
Connected: No
Charging: No
Hardware Configuration:
Clamshell Closed: No
UPS Installed: No
If anyone has any suggestions I'll love them forever.
My sanity is going on this.

Welcome to the Apple discussions.
There's only 4 components in the charging circuit: power adapter, DC-in card, battery, and logic board. Do you know for a fact that your power adapter is working? If yes, then not running on the power adapter says either the DC-in card is bad (the card that has the jacks on the left side of the computer) or it's a logic board issue. Is the female jack where you plug the power adapter in visibly damaged, loose, or the case around the socket damaged? If the socket is wiggly loose, likely a new DC-in card is in order. Does the power adapter light up at all when you plug it in?
We had a similar, but not exact, situation recently on one of our Powerbooks, and ended up taking it to the Apple store, where they sent it to the Apple depot for repair. They replaced the logic board and put a new battery in. The Depot service returns the machine with anything needing repair, repaired. If everything is in good physical order, ie the case isn't damaged, it costs around $325, which is less than getting a new logic board put in at the store. If the case is damaged, a trip to the Apple depot costs more. A new DC-in card card + installation by Apple runs around $130, give or take. Used DC-in cards run around $75-$95 if you want to install it yourself.

Why does my macbook only turn on when the power adapter is plugged in?

The battery life says its at 73% and climbing but whenever I unplug my power adapter the mac automatically shuts down and if I try to turn on the macbook without my power adapter plugged in, it wont turn on. How do I make it go back to where I can turn the mac on without it being plugged in? Thank you for your help!

I would try two things the first being resetting the System Management Controller:
1) If the computer is on, turn it off.
2) Disconnect the AC Adapter and remove the computer's battery.
3) Press and hold down the power button for 5 seconds and then release the button.
4) Reconnect the battery and AC Adapter.
5) Press the Power button to restart the computer.
If that doesn't work I would recalibrate the battery.
To calibrate the battery:
1) Plug in the MagSafe power adapter and fully charge the MacBook or MacBook Pro battery until the light on the MagSafe connector changes to green and the Battery icon in the menu bar indicates that the battery is fully charged.
2) Allow the battery to rest in the fully charged state for two hours or longer. You may use your computer during this time as long as the power adapter is plugged in.
3) Disconnect the power adapter with the computer on and start using it with battery power. When the battery's charge gets low, you’ll see the low battery warning dialog on the screen.
4) Continue to keep your computer turned on until it goes to sleep. Save your work and close all applications when the battery's charge gets low and before the computer goes to sleep.
5) Turn off the computer or allow it to sleep for five hours or longer.
6) Reconnect the power adapter and leave it connected until the battery is fully charged. You may use your computer during this time.

Stop the sleep blinking light in lenovo g-470, whining sound from the power adapter , HEEEEEELP !!!

Hi, hope anyone can help me.
I own a lenovo b560 and a g470, the sleep light will blink when I go to sleeping mode, anyway the problem is not the light, the problem is the whining sound it produces the power adapter when the light start blinking, in both machines I hear that whining noise, but in the g470 is much louder, I don´t know if this is because I have a faulty adapter or something, the strange thing is that both adapters make the noise when I sleep the laptop, when I turn off or hibernate the whining sound disappear.
Also, I notice that the whining sound alternate in 2 types of sounds, one is high in pitch and the other lower, the high pitch is when the blinking light turn on when go to sleep and the lower pitch of the sound is when the light go off, and that is repeating until I resume the laptop, it´s very annoying, especially when I´m in a quiet room.
So my theory is that maybe somehow I can turn off the blinking light when the laptop goes to sleep and then maybe the whining sound will go away, but I don´t know, it´s only an a idea.
Any help will be appreciated.
Thanks !
Solved!
Go to Solution.

I can really understand your pain with this issue.
Kindly update the BIOS and display driver from the lenovo website then check if the issue persist.
The issue should be resolved after this.
Best Regards,
Tanuj
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I went on my MacBook Pro this morning and found out that my Macbook Pro isnt charging, is the power adapter damaged? Or is it the power adapter string that attatches to the Macbook Pro?

I dont know what is wrong with my computer,if is it because there is something wrong with my MacBook Pro or if its the actual power adapter or the string that attatches the power adapter and the computer. HELP PLEASE!!!

Have you tried to do an SMC/PRAM reset?
Also, need to know how old your MB Pro is.

Couldn't find the power adapter. what should do?

I moved into an new house a couple weeks ago. I couldn't find the power adapter of the WRT54G router. It may have gottten lost during the moving.
I bought this router from Staples last year. When I checked with them yesterday, they were saying that they don't sell the power adapter seperately. What should I do now? I couldn't get the home network set up without the power adapter of the router. Any help will be appreciated.

Try Radio Shack or The Source (Radio Shack in Canada). Take the router and any documentation that came from it so that the adapter can be matched. (Note the specs in the appendices, which should show 12V DC, 0.5A) Also suggest Best Buy or Future Shop (if in Canada), since they sell Linksys routers and have a good service desk.

Verizon Westel 327W abroad - Buzzing sound from the Power Adapter ?

So I moved to Caribbean Islands for schooling and the DSL Modem from local company here was plain 1 port one. The voltage here is 220V, so I have put a transformer and then plugged my Westel 327W into 110V and it works great.
However, I am noticing a buzzing sound from within the power adapter. The adapter is running somewhat hot since I plugged it in a few days ago. Should I be concerned about this buzzing sound or is it just that its sitting on my desktop and I am noticing it now ? Its loud enough to be heard in a completely quite small room....
Thanks

Hi D_U, sorry to hear of your issue, sounds electrical and thereby out of my scope of support.
Constance
Verizon Telecom
Fiber Solution Center
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Just purchased an 11" Mac Book Air, and I'm using it as a desktop. Is it ok to lea the power adapter connected all the time?

I'm using my macbook air as a desktop unit, with an auxiliary flat panel display, as well as an external storage drive and a CD/dvd drive. Is it safe to leave the power adapter connected to the computer all the time? Will the battery life get affected or shortened by being fully charged all the time?

Apple recommends that for best battery life, you allow the battery to discharge occasionally.
Here's a good link:
http://www.apple.com/batteries/notebooks.html

Noise on audio output when using the power adapter

I'm a musician and use my mid-2007 MBP 15" in my live rig. When I use the power adapter, I hear a buzz, sometimes accompanied by a slightly louder buzz that cycles on & off about 1x/second. There are a few weird things going on here:
1. The buzz does not happen all the time. That leads me to think it may be noise in the AC line that the adapter is plugged into.
2. The noise is heard when I use both the built-in audio output AND an external USB audio interface.
In any case, when I disconnect the power adapter and run my MBP on battery, the noise goes away completely. I can probably do this on most gigs, but I'm a little nervous since I run a FW drive, an external USB audio interface, and my midi keyboard (powered by USB) so I am putting a little heavier than usual load on the MBP's battery.
As I said, this may be a noisy AC line. Another guess is that it's the PMU inducing noise into the audio circuitry. I'm hoping a simple AC line filter can help me but I thought I would ask here first in case anyone else has dealt with this. TIA for any help!

I had a similar problem and fixed it with a $5 universal travel adapter. Yours might be different but here's my situation. Try it for little cost and see if it works.
I'm also a muso with an iMac running external KRK speakers via USB Mbox2. Previously I had a Macbook Pro and the same audio problem. I've been putting up with a very low volume, high pitch noise until now. I simply plugged the Mac power cord into a universal travel adapter which then goes into the wall. For Aussie users there is an adapter on ebay that will allow a 3 pin Aussie plug to go into female side and has a two pin Aussie male on the other. For US users you can probably get the same although there is a 59c product that will do the trick called a ground lift adapter. Applecare actually agreed this was the best fix and confirmed there would be no problems with power supply or Mac performance. What a gem ! God knows I've looked into all kinds of alternatives that could have cost hundreds instead of $5.

What is the necessity of the AC power cord (with Mac Book Air)? When should it be used with the power adapter?

what is the necessity of the AC power cord (with the Mac book Air)? when should it be used?

Gary, you wouldn't believe some of the questions people ask on this site.
Why are both cords necessary?
They are not.
Other than the two reasons dominic23 sited are there any other reasons to use the AC power cord rather than the power adapter cord alone?
No.

Can I use the Ipad3 power adapter for the Iphone5

Can I use the Ipad3 power adapter for the Iphone5 or vice versa?

No more than usual...
A quick search will yield the number of times this comes up.
I have been charging my 4s with mu iPad 2 charger since new

When using my power adapter, the light is green for a two seconds and turns red.

When using the power adapter for my MacBook 2.1, the little light on the connector is green for 2 or 3 seconds and then turns red. I bought a new adapter, but it is the same thing. It looks like the computer is charging. What's wrong with it.

Nothing wrong. Here is what Macbook manual has to say:
When you first connect the power adapter to your computer, an indicator light on the
power adapter plug starts to glow. An amber light indicates that power is going to the
battery. A green light indicates that no power is going to the battery, which can mean
the battery is fully charged, is not installed, or has a problem. If you don’t see a light,
your plug probably isn’t seated correctly. Check for any debris and remove it. You can
monitor the battery level using the Battery status menu in the menu bar or by
checking the battery level indicator lights on the bottom of the battery (see page 74).

Is it safe to use the power adapter without the grounding pin?

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