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Apple Computing Products:
macOS - Notebook Hardware
Mac USB Ports Not Operating ???
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<blockquote data-quote="EvenStranger" data-source="post: 1151566" data-attributes="member: 181804"><p><strong>What model Mac?</strong></p><p></p><p>It would help to know what model Mac you're using. The older MacBook Pros (pre-unibody) had two boards internally, the main logic board which controlled the USB ports on the right, and a daughter board controlling the left USB, power and audio input. On those units, a USB device might work fine on the right, as it's connected directly to the motherboard, but not on the left, due to slightly reduced voltage. Similar behavior was seen on white iMacs - the ports closer to the center of the machine would work fine, but the outermost wouldn't as it's on the sound card as well and has slightly reduced voltage.</p><p></p><p>If none of the USB ports are reading the drive, but a usb mouse and keyboard are working, I'd consider the possibility of a USB mass storage driver being corrupted.</p></blockquote><p></p>
[QUOTE="EvenStranger, post: 1151566, member: 181804"] [b]What model Mac?[/b] It would help to know what model Mac you're using. The older MacBook Pros (pre-unibody) had two boards internally, the main logic board which controlled the USB ports on the right, and a daughter board controlling the left USB, power and audio input. On those units, a USB device might work fine on the right, as it's connected directly to the motherboard, but not on the left, due to slightly reduced voltage. Similar behavior was seen on white iMacs - the ports closer to the center of the machine would work fine, but the outermost wouldn't as it's on the sound card as well and has slightly reduced voltage. If none of the USB ports are reading the drive, but a usb mouse and keyboard are working, I'd consider the possibility of a USB mass storage driver being corrupted. [/QUOTE]
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Apple Computing Products:
macOS - Notebook Hardware
Mac USB Ports Not Operating ???
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