[kirkmc adds: You never know... I guess this has something to do with letting the capacitors somewhere inside the Mac lose their power...]
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The front USB port of my dual 2.0 gHz G5 desktop seemed to go dead. Flash drives would blink once and not mount. System profiler would show nothing in the port. A discussion on an Apple hardware forum had the solution: shut down the desktop and unplug the power cord for 30 minutes. Restart with nothing connected, then connect each USB component. I tried it and I found all the ports working again!
[kirkmc adds: You never know... I guess this has something to do with letting the capacitors somewhere inside the Mac lose their power...]
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Recover apparently dead USB ports
Pulling the PRAM battery will sometimes help with things like this. Remove the PRAM battery and then let the computer sit, with no power cord or battery attached, for 20 minutes or more.
Recover apparently dead USB ports
I can confirm that sometimes switching of the machine and waiting a few minutes indeed reactivates broken USB ports. Happened to me on a PowerBook G4.
Recover apparently dead USB ports
I've seen this documented elsewhere and had to use this trick to recover the apparently dead firewire ports on my mdd g4. It worked beautifully and the ports have been working great ever since.
Recover apparently dead USB ports
You never know... I guess this has something to do with letting the capacitors somewhere inside the Mac lose their power...
Actually, the described procedure results in resetting the SMU (System Management Unit) of a PowerMac G5. See this Apple technical note: "How to reset the SMU..." The article states that: Resetting the SMU can resolve some computer issues such as not starting up, not displaying video, sleep issues, fan noise issues, and so on. Cheers, Jim M. Apple Certified Help Desk Specialiast, Milwaukee, WI YourMacDoc Macintosh Help and Consulting Services YourMacDoc.com
Recover apparently dead USB ports
Yup - i had this problem on my powerbook g4. First the port on the right, then weeks later the other. Spent 5 minutes on the phone with tech support, AFTER clearing out company data from the hdd thinking i had to send it in for a new logic board or something. All better :)
Recover apparently dead USB ports
I had the problem of "dead" USB mouse particularly with thin cables and dual CRT monitor setups (Mac, Windows or Linux), and I have this problem still occasionally on any OS (Mac, Windows or Linux).
Recover apparently dead USB ports
For old systems with ADB, there was a little tool from Apple to reset the bus. Those utilities often come with developer stuff and SDKs, so it might worth looking into that direction. A simple modprobing the kernel modules won't work on PPC hardware I guess, but I never tried it.
Recover apparently dead USB ports
This worked for my MacBook Pro and its dead FireWire port. System Profiler said I had a FireWire bus, but nothing happened when I plugged in a FireWire device. Shutdown, unplugged, and removed the battery for 30 minutes, and my FireWire port started working again! Yay!
Recover apparently dead USB ports
One thing about this, you should also turn off/unplug each peripheral as well. What's good for the goose.... |
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