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<blockquote data-quote="AirBear" data-source="post: 1852683" data-attributes="member: 404250">I almost never shut this iMac down, just put it in sleep mode.&nbsp; &nbsp; Probably haven't even rebooted it more than a few times since I bought it a couple months ago.&nbsp;&nbsp; Yesterday I shut it down after received some new RAM in the mail, I was going to upgrade from 8 to 24GB.&nbsp;&nbsp; Shut the iMac down, pulled the plug, opened the memory door and had a &quot;duh&quot; moment when I realized I had ordered desktop ram, not laptop style like the iMac uses.&nbsp; &nbsp; Never put my hand inside the RAM area, just put the door back on, plugged in and started back up.&nbsp;&nbsp; &nbsp; Found out my USB keyboard didn't work anymore, but the USB mouse was OK.&nbsp;&nbsp; The keyboard is from my 2012 Mac Mini so I figured it had died.&nbsp;&nbsp; Tried switching USB ports with no luck.&nbsp; Then I plugged it into my 10 port USB hub and it worked.&nbsp;&nbsp; A short time later my Logitech mouse starting acting up.&nbsp;&nbsp; I plugged it into my Thunderbolt 3 external drive enclosure which has 3 USB ports and now it works fine.&nbsp; &nbsp;&nbsp; Short of taking this computer in for warranty repair any ideas?&nbsp; &nbsp;&nbsp; The 10 port USB hub is plugged into one of the 4 iMac USB ports so not all of them are dead/malfunctioning.&nbsp; Accessing USB via the Thunderbolt enclosure seems to work fine so I could use that as a workaround for now.&nbsp; The RAM is going back to BestBuy, this time I paid extra and ordered from OWC to be sure I get the right type. Thanks,AirBear</blockquote>

[QUOTE="AirBear, post: 1852683, member: 404250"] I almost never shut this iMac down, just put it in sleep mode. Probably haven't even rebooted it more than a few times since I bought it a couple months ago. Yesterday I shut it down after received some new RAM in the mail, I was going to upgrade from 8 to 24GB. Shut the iMac down, pulled the plug, opened the memory door and had a "duh" moment when I realized I had ordered desktop ram, not laptop style like the iMac uses. Never put my hand inside the RAM area, just put the door back on, plugged in and started back up. Found out my USB keyboard didn't work anymore, but the USB mouse was OK. The keyboard is from my 2012 Mac Mini so I figured it had died. Tried switching USB ports with no luck. Then I plugged it into my 10 port USB hub and it worked. A short time later my Logitech mouse starting acting up. I plugged it into my Thunderbolt 3 external drive enclosure which has 3 USB ports and now it works fine. Short of taking this computer in for warranty repair any ideas? The 10 port USB hub is plugged into one of the 4 iMac USB ports so not all of them are dead/malfunctioning. Accessing USB via the Thunderbolt enclosure seems to work fine so I could use that as a workaround for now. The RAM is going back to BestBuy, this time I paid extra and ordered from OWC to be sure I get the right type. Thanks, AirBear [/QUOTE]

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