The power adapter

Hello all,
i can't find out this any where yet does any one know if the megasafe power adapter that you get with mac books is a real power adapter in that if i take my mac book to another country as long as i change the plug it will work?

Yeap... Its a real power adapter... I use it in Brazil without problems ! As long as the pins match i think you wont have any problems...

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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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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.

Laptop won't turn on - the power adapter light flashes three times? G62 b29SA

I've been replacing the fan in my friend's laptop. I had a problem with the trackpad not working after I put it back together and that problem is not yet resolved but I have another problem preventing me from getting further. Now when I press the on button, the power adapter light (next to the socket for the external power) flashes three times and that's all. It flashes again three times every time I press the power button. It does this even with an external power source plugged in (I'm pretty sure that it's supposed to just stay on constantly when the charger is plugged in but the power source I have is a universal one set to 19 V - it has powered up with this plugged in before but I don't know whether it was taking charge from it). Any advice?
This question was solved.
View Solution.

I got the charger from my friend and now it boots up just fine. There seem to be many meanings to the three flashes based on my Internet searches but in this case it appears that it's some way of indicating a low battery.

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.

The power adapter gets very hot. Any suggestions?

The power adapter part that plugs into the computer gets very hot. I have replaced the battery and replaced the power adapter. It also has a hard time connecting and recharging the battery. Is it possible to change out the plug in part in the computer and is it expensive? Does it sound like this is what is needed to fix it? Its about 3 years old. Any suggestions would be appreciated. Thanks.

Hot is normal for the charger but very hot is not. If it were mine It could be that your MBP is drawing too much current. I would take it to the Apple Store and have it checked out.
Allan

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.

Where can I find a replacement for the power adapter tip?

I need to replace the small adapter that allows the power adapter to be inserted into a socket. Does apple sell this part separately?
The adapter itself works fine. But the tip that gets inserted into the adapter, and then the wall, has started to make sparks. I'm afraid it's going to catch fire, or cause a fire. When plugged into the wall, I hear sparks and I see smoke coming out. If I adjust it's position by slightly withdrawing it from the wall socket, so that there is minimal contact, the sparks stop. But I am a little worried now that I can't leave my MacBook Pro retina plugged in without risk of fire. This started about a month ago after two years of use without any issues.
To be clear, I'm not talking about the adapter itself, but the tip that gets inserted into the adapter, and in turn allows the adapter to be inserted into a socket.
It seems wrong to shell out $80 for a whole new adapter when all I need to replace is the wall adapter.

What about the world travel adapter
http://store.apple.com/us/product/MB974ZM/B?fnode=MTY1NDEwMQ
The Kit is designed to work with iPod, iPhone, iPad, Apple MagSafe Power Adapters (for MacBook and MacBook Pro), Portable Power Adapters (for iBook and PowerBook), and AirPort Express.

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.

Question about the Power adapter

I just got my Macbook and I love it but I'm a bit confused as to the function of the power adapter. I plugged it in and it started to charge my battery. Is this supposed to happen? I thought the function of the adapter was to provide continuous power from an outlet supply. Maybe I'm under the impression that the second cord I received with my macbook is a power supply cord. Is it?

Also You can run the computer without your battery in but I believe it's not good for the computer.
This link explains the point you were making. MacBook reduces processor speed when battery is removed while operating from an A/C adaptor

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

Overheating at the power adapter location shuts down computer

On occation Powerbook gets hot near the power adapter input. The unit shuts down with what sounds like the fan running, I must hold down the power button until it restarts. The unit is on a flat hard surface and the battery and charger function properly. I ran the hardware test, off the CD, which indicted all OK.
Any ideas of what the problem may be?
Powerbook G4 15 Mac OS X (10.3.9)

The best thing that you can do is purchase an enclosure for your internal drive (see -> http://eshop.macsales.com/search/2.5%22+usb+enclosures), use a Phillips #00 screwdriver and a Torx T6 screwdriver (also available in a kit from OWC/macsales -> http://eshop.macsales.com/item/NewerTech/TOOLKIT14/) and get the hard drive out and into the enclosure (it's quite simple to do and there are videos at OWC that will help -> http://eshop.macsales.com/installvideos/).
Once the drive is in the enclosure you can plug it into any Mac and retrieve your data. Probably the best thing to do would be purchasing an external drive and copying (or cloning, see -> http://www.bombich.com/) the data from your internal (now in the enclosure) to the external drive.
Then reverse the process, putting your internal drive back in place, and take your machine to your local Apple Store or an AASP. I know that it sounds rather convoluted, but you'll be able to use the external drive afterwards to make backups (see -> Most commonly used backup methods).
Make sense? Or am I just being confusing?
Clinton

HT3131 how can i run in clamshell without the power adapter plugged in?

just what the question states..I dont want to have to always connect the power adapter. thanks

thanks this works well with the power adapter pluged into the mac, but I am looking for this exact setup without the need for the power to be supplied to the mac.
in otherwords, run it off the battery only.
I want to think that there is either a preferences setting, or function to be able to do this.
currently it appears that the mac will only run in the configuration with external perpherials with the power supply.

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.

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)

HT1635 where can I get the power adapter for MC207xx/A . It's a 60W "T" connector

where can I get the power adapter for
MC207xx/A . It's a 60W "T" connector

You can get a new third party 60W power adapter on eBay for under $20.
http://www.ebay.com/sch/i.html?_nkw=macbook+power+adapter&_sacat=0&_sop=12&_dmpt =Apple_Laptops&_odkw=macbook+power+adapter&_osacat=111422&_trksid=p3286.c0.m270. l1313
Or for $80 from Apple http://store.apple.com/us/product/MC461LL/A

The power adapter

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