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User profile for user: reggie1998
reggie1998 Author
User level: Level 1
4 points

MIDI Keyboard Using Too Much Power. USB Accessories have been disabled.

HELP! MIDI Keyboard Using Too Much Power


I have a MacBook Pro from early 2013 and have recently encountered issues with my MIDI Keyboard. The keyboard was in full working order for a good 2 years, but now when I plug it into my MacBook, either directly or through a Powered USB Hub, I receive a message saying that USB has been disabled as an accessory is using too much power. The MIDI Keyboard I own is a Novation LaunchKey 49 and I have recently purchased a 9v AC adapter to provide power to the keyboard to fix the issue, but unfortunately it hasn't worked.

Anyone know of another way to get it working? I purchased the Powered USB Hub as I read online that should do the trick, but in fact my MIDI keyboard burnt out the outlet it was plugged into on said Hub.

Any help would be greatly appreciated!

Posted on Jan 23, 2022 4:33 AM

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User profile for user: ku4hx
ku4hx
User level: Level 7
23,586 points

Posted on Jan 23, 2022 4:56 AM

When an electronic device suddenly starts using excessive power, as this one seems to be doing, it may be an indication of an internal fault (short circuit) or a failed component. Not all electrical faults spark and smoke, sometimes they just heat up (in similar fashion to an electrical resistance heater) before they fail completely. This situation almost always causes excessive power usage.


If it were my device, I'd have it checked by a licensed repair shop for such devices.


If the MIDI keyboard did indeed "burn out" the adapter, that is to me a sure sign it's drawing excessive current and needs to be evaluated. You can do that yourself with an inexpensive, non intrusive, multimeter. Some will read current flow through a line by sensing the field along the exterior of the line or cable. But, it's likely best to leave the evaluation to a competent repair shop ... if you can find one.

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User profile for user: ku4hx
ku4hx
User level: Level 7
23,586 points

Jan 23, 2022 4:56 AM in response to reggie1998

When an electronic device suddenly starts using excessive power, as this one seems to be doing, it may be an indication of an internal fault (short circuit) or a failed component. Not all electrical faults spark and smoke, sometimes they just heat up (in similar fashion to an electrical resistance heater) before they fail completely. This situation almost always causes excessive power usage.


If it were my device, I'd have it checked by a licensed repair shop for such devices.


If the MIDI keyboard did indeed "burn out" the adapter, that is to me a sure sign it's drawing excessive current and needs to be evaluated. You can do that yourself with an inexpensive, non intrusive, multimeter. Some will read current flow through a line by sensing the field along the exterior of the line or cable. But, it's likely best to leave the evaluation to a competent repair shop ... if you can find one.

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MIDI Keyboard Using Too Much Power. USB Accessories have been disabled.

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