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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 is way less than the 500 mA provided by the MBP's USB 2.0 port. If I plug it into a desktop PC, it works. What can be the problem? An USB hub would solve this issue, I suppose, but can I avoid buying one?

  • Is it same on all USB ports? – Ruskes May 6 '13 at 13:49
  • Yes, I tried all of them. With other devices (iPad, pendrive) they work properly. – thSoft May 6 '13 at 13:59
  • Start the Garageband and check under preferences- audio if it has detected your midi device. – Ruskes May 6 '13 at 14:10
  • Did you check they web site for downloads ? – Ruskes May 6 '13 at 14:26
3

I do not think it is a power problem.

Check in GarageBand if your device is showing up.

If not: I would start with getting the latest software for your MIDI device

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  • And you were right, after installing the latest driver, it works! I couldn't imagine that the powered state of the hardware depends on a driver software... – thSoft May 7 '13 at 7:42
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    You are welcome. Just to clarify, YES! the system has to recognize who is knocking at the door (the right driver) before giving it "permission" to enter. ;) – Ruskes May 7 '13 at 7:54
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http://forums.rolandclan.com/viewtopic.php?f=54&t=45738 On my A49 you have to hold down the "Function" "Pitch" and "Assign" buttons on the keyboard all at the same time as you power it on.

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You will need to disenable the SIP control of the Mac OS. Here a link that tells you how to do that; http://osxdaily.com/2015/10/05/disable-rootless-system-integrity-protection-mac-os-x/

  • Welcome to Ask Different! We're trying to find the best answers and those answers will provide info as to why they're the best. Explain why you think the link you provided will answer the question. Links can change and become outdated so we prefer the answers to not just be a link. See How to Answer on how to provide a quality answer. - From Review – fsb Nov 27 '16 at 15:27
-2

Have you Check the Cable? Most thats Simple is it or the Plug not Right in there.

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