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Apple Computing Products:
macOS - Desktop Hardware
2019 27" iMac, USB ports failing after opening memory door
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<blockquote data-quote="krs" data-source="post: 1852744" data-attributes="member: 67742"><p>Based on the first post, it's not really clear to me which USB ports on the iMac work and which ones don't.</p><p></p><p>The 2019 iMac has four USB ports, maybe if you number them 1 to 4 from left to right and check each one individually.</p><p></p><p>Don't know about this Mac specifically, but other Macs with 4 USB ports sharecontrollers between two of them, usually port 1 & 3 and 2 & 4, so if one of the controllers is not working, one would still have two ports that do work.</p><p>Not saying that is the problem, but it's something to be aware of.</p><p>If anyone has a schematic of this iMac, it's easy enough to see ifany USB ports are shared and if so, which ones.</p><p></p><p>You also mentioned that the USB keyboard did not work but the USB mouse did.</p><p>Again, which USB port did you plug those devices into? I usually plug the USB mouse into a USB port on the keyboard.</p><p></p><p>And if you look under System Report > Hardware > USB</p><p>You should get some hints on which USB ports work and which ones do not</p><p></p><p>...or actually run a hardware test.</p></blockquote><p></p>
[QUOTE="krs, post: 1852744, member: 67742"] Based on the first post, it's not really clear to me which USB ports on the iMac work and which ones don't. The 2019 iMac has four USB ports, maybe if you number them 1 to 4 from left to right and check each one individually. Don't know about this Mac specifically, but other Macs with 4 USB ports sharecontrollers between two of them, usually port 1 & 3 and 2 & 4, so if one of the controllers is not working, one would still have two ports that do work. Not saying that is the problem, but it's something to be aware of. If anyone has a schematic of this iMac, it's easy enough to see ifany USB ports are shared and if so, which ones. You also mentioned that the USB keyboard did not work but the USB mouse did. Again, which USB port did you plug those devices into? I usually plug the USB mouse into a USB port on the keyboard. And if you look under System Report > Hardware > USB You should get some hints on which USB ports work and which ones do not ...or actually run a hardware test. [/QUOTE]
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Apple Computing Products:
macOS - Desktop Hardware
2019 27" iMac, USB ports failing after opening memory door
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