Tagged Questions
2
votes
1answer
32 views
No power through USB for Roland A-49
I just plugged my Roland A-49 to my MacBook Pro (Early 2011 2.3 GHz). The MIDI keyboard would have its power supplied via USB, but it has no power. The specification says it needs 98 mA current, which ...
1
vote
1answer
45 views
know how many watts a USB device is consuming
I know it's possible to do some electric hack to know how much current a device is using... but that would be a 1 time usage so it would be a waste of money and parts.
Is it possible to know that ...
1
vote
0answers
1k views
iPad 4 not charging solution with usb 3.0 dual ports Y adapter
Just recently picked up an iPad 4. Saw that it specifies "not charging" when plugged into the usb port. Saw that it is a common issue due to usb power. I have usb 3.0 ports on my desktop so I tried ...
1
vote
2answers
1k views
Retina macbook max USB power output
Could someone tell me how much Ampere the retina macbook pro can deliver over usb. I thought that one should be able to charge an ipad with a retina macbook which would mean, that it should be about ...
0
votes
0answers
168 views
Mountain Lion usb power on standby
I connect my iphone to the macbook pro overnight to sync and charge it - since Mountain Lion, when the macbook goes into standby, the charging stops, and the battery drains. Is there a way to resort ...
4
votes
1answer
283 views
At what point do iPads stop displaying “not charging” when connected to power?
I am curious if anyone has measured directly or found an authoritative reference that documents at which point the various iPad will display charging and not "not charging" in the menu bar while ...
4
votes
2answers
4k views
How do you check how much power a Mac USB port can deliver?
This question is similar to the superuser question "How to check how much power a USB port can deliver", which is answered for Linux and Windows.
How do you check the same on a Mac?
4
votes
5answers
15k views
“USB device drawing too much power” error on startup with no devices connected
Since upgrading to Lion, I get this error every time I start up:
I've read the answers suggested here, but they seem to indicate that it's the presence of a second device that's causing the ...
0
votes
1answer
751 views
USB thumbdrive plugged into Macbook Pro which instantly goes black, bricked?
New 2011 Macbook Pro 8,3 less then three months old, this is my first ever Apple product.
I have an old USB thumbdrive I couldn't remember what was on it so I plugged it into the USB port nearest the ...
5
votes
2answers
4k views
How to monitor USB power consumption?
I'm looking for a way to monitor the power being drawn from the USB ports on my Mac.
System Profiler doesn't appear to display this and I haven't been able to find any applications or tools to do the ...
8
votes
2answers
703 views
Why can my Mac charge my iPad but other computers can't?
What do Macs do differently so its USB ports can charge my iPad, but if I plug into a USB port on my PC I get the "not charging" message?
1
vote
1answer
903 views
Does latest MacBook Air have powered USB ports?
I see that the latest 13 inch MacBook Air has two USB 2.0 ports, but can they power, say, a 2.5 inch external hard drive?
16
votes
5answers
7k views
iPad displays “Not Charging” when plugged into USB ports. What can I do?
When I plug my iPad into my computer's USB ports, the iPad battery area displays "Not Charging".
I understand the iPad requires more wattage to charge compared to an iPhone or iPod, as evidenced by ...
