Model A1237 or A1304 / 1.6, 1.8, 1.86, or 2.13 GHz Core 2 Duo processor

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USB over current problem

Hi, i have a MacBook Air early 2008 and the problem with it is that the USB port always shows over current status even when nothing is plugged in, also the laptop doesn't go to sleep mode when I close the lid it just turns of the display.

I did reset the SMC and it worked fine for about half an hour or so but then started to fail again.

I Think I may have to replace the logic board and if that's the case, could I replace the logic board with the one for the a1304? which can be upgraded to yosemite and is of a similar price.

Update (06/21/2015)

Usually is only usb sticks and maybe the iphone, but sometimes the popup comes even without anything connected to the mac at boot, also when installing Mac OS from a shared optical drive over wifi on verbose mode i can see that there is over current on the port, this happens with or without the charger.

Here is the screenshot that you requested.

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I do not understand "shows over current status", could you elaborate on this?


yes of course, a popup keeps showing that says "some usb device is using too much current and had to be disabled" or something like that, if i have a usb stick connected it just stops working and it makes it impossible for me to install Mac OS X from usb or use bootcamp.


Did you spill something into your system or sit it down on a wet surface? It might be some corrosion on the logic board around the USB ports.


Not that i know of, and besides the logic board does not show any signs of corrosion.


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1 Answer

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What are the USB devices you have plugged in here? It sounds like one or more maybe needing more power from your system than what the system can supply. Also was this with the AC Power adapter plugged in or not?

It might be your systems battery needs to be replaced. Give this app a try: coconutBattery. Post a screenshot for us to see.

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