Macbook Shutsdown when power adapter is plugged.

Hello,
My Macbook (Jan 2007), is not charging. when i plug the magsafe it goes off. The charging lite turns green just after few seconds, it does'nt stay orange. I have tried everthing resetting SMC, PRM, changing battery etc. Does anyone have any clue, as to why is this happening. I hope its not anything to do with the Logic Board, i guess not, checked the HD other stuff-just don't what to do. Macbook is dead, no way to put in on. Would appreciate any suggestions. Thanks

I too have periodically experienced a strange noise (spinning/hissing/scratching) coming from the area where the power adapter cord plugs in to my powerbook. The sound is louder than my HD activity.
It happens only after plugging in the power cord while the computer is on with a semi-discharged battery. If I shut the computer down while it is making the noise, the sound level decreases durring the shutdown and becomes very quiet when powered off (possibly stops). The noise also stops when the cord is unpluged with the computer running but returns when plugged back in without restarting the system.
This does not occur every time I plug in as described above.

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I too have periodically experienced a strange noise (spinning/hissing/scratching) coming from the area where the power adapter cord plugs in to my powerbook. The sound is louder than my HD activity.
It happens only after plugging in the power cord while the computer is on with a semi-discharged battery. If I shut the computer down while it is making the noise, the sound level decreases durring the shutdown and becomes very quiet when powered off (possibly stops). The noise also stops when the cord is unpluged with the computer running but returns when plugged back in without restarting the system.
This does not occur every time I plug in as described above.

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Hi
Try resetting the SMC. This sometimes solves this type of problem, in fact, it's listed as one of the reasons why you should try this:
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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.
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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.
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http://www.apple.com/retail/geniusbar/
If not US, check here;
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Michael J Harnest wrote:
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lochidaga wrote:
Hi! Im new user of Mac, I use my laptop as a desktop. Do I run it on battery and just recharge after every discharge? or do I use AC power the whole time with my battery in the Mac? Or should I remove the battery while using under AC, with my old laptop I remove the battery and use AC plug always. Thanks
The usual recommendation is to keep it running off the adapter power, but let it run off battery power maybe once a month or whenever you take it on the road and don't have an outlet. Running it periodically off the battery keeps it calibrated and is good for the ultimate life of the battery.
http://support.apple.com/kb/HT1490
Batteries slowly degrade after each charge. If you use it off the battery twice a day for a year, you're going to find that your battery life is noticebly degraded. I've heard the magic number is 300 cycles (this is recorded in the battery I believe), where Apple won't replace a battery under warranty if it the battery life is noticeably degraded. Laptop charging systems for lithium rechargeable batteries are designed to prevent overcharging by charging up to maximum, then only topping off when it drops below a certain amount (I thought it was 95%). There's no "trickle charge". Apple has a definition of "all the time" that excludes monthly use off of battery power. There's a difference between leaving it plugged in "most of the time" versus "all of the time".
http://www.apple.com/batteries/notebooks.html
*Standard Maintenance*
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That monthy iCal reminder link is in the above page on the right where it says "Remind me to charge and discharge my notebook battery".

Macbook Shutsdown when power adapter is plugged.

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