Yves Hertoghs Posted September 23, 2015 Share Posted September 23, 2015 Hi, I was trying to troubleshoot audio streaming issues between my SSL Nucleus Soundcard/Control-Surface and my new iMAC running 10.10.5. As it turns out the Nucleus is USB2 and all my iMAC ports are USB3, and SSL do say that there are issues with this configuration, and indeed the audio performance is really bad. After some googling i thought i found a way to turn my USB3 ports to USB2 'mode' by adding a kext file via kext wizard to the IOUSBFamily.kext extension. I made sure I backed up the original IOUSBFamily.kext, rebooted and here i am with a dead iMAC: none of my bluetooth devices (Magic Mouse, Magic Trackpad, Apple Wireless Keyboard) are recognised and I can't login, it just sits there at the login screen but i can't point my mouse or type my password. I tried to take the batteries out of all peripherals (put them back into discovery mode) and reboot the iMAC but nothing. It even does not seem to complain that there is no keyboard/mouse attached. I tried plugging in a USB mouse but it also doesn't register. I don't have a USB keyboard in the house to see if that would register. I can see the iMAC over the network but have only turned on File Sharing unfortunately. Using my MacBook Pro I can browse to the /System/Library/Extensions directory on my iMAC, but cannot delete the corrupt IOUSBFamily.kext file and replace it with the backup one due to permission issues. I've tried SSH-ing to the iMAC but SSH is turned off. I tried resetting the SMC but that didnt help. I can't get into any of the special Startup modes as i cannot get a keyboard to attach! I am trying to borrow an USB keyboard or burn Yosemite onto an USB drive, but I fear its no use as none of the USB ports are recognised. It does seem the Thunderbolt ports are working as i can connect my MacBook Pro to the iMAC using a Thunderbolt cable. Unfortunately i don't have a Thunderbolt to USB dongle! Any idea how to approach this ? Thanks! Yves Link to comment Share on other sites More sharing options...
jperkins909 Posted September 23, 2015 Share Posted September 23, 2015 This is why Time Machine was created? thank god for back ups! Or take out the HDD and plug it into another machine. Link to comment Share on other sites More sharing options...
bronxteck Posted September 23, 2015 Share Posted September 23, 2015 https://support.apple.com/en-us/HT201462 Link to comment Share on other sites More sharing options...
Yves Hertoghs Posted September 25, 2015 Author Share Posted September 25, 2015 This is why Time Machine was created? thank god for back ups! Or take out the HDD and plug it into another machine. The problem is really that there is NO way currently to connect a mouse/keyboard to the iMAC. Taking out the HDD is probably an idea, but as this is a new iMAC its sorta hard to do. I did notice that the Thunderbolt Port is still functional (I can access the iMAC from my MacBookPro across a thunderbolt bridge connection), so I might try to borrow a thunderbolt dock and see if that picks up a USB keyboard/mouse. https://support.apple.com/en-us/HT201462 Hi, I looked into that already, but then i need to get the iMAC in target disk mode, which i can't as the keyboard/mouse don't work i.e. i can't hold down T, or i can't login to reboot it into Target Disk Mode. Is there a way to 'force' a MAC into Target Disk Mode without having to use the keyboard? Any other idea folks ? Thanks! Link to comment Share on other sites More sharing options...
duffs Posted September 25, 2015 Share Posted September 25, 2015 What about recovery ? keyboard should work at start up. After you power up iMac pres alt key to boot into recovery mode. There you have terminal. you can copy backup kexts to /System/Library/Extensions/. repair permissions. After reboot press SHIFT key to boot in SAFEMODE. 1 Link to comment Share on other sites More sharing options...
Yves Hertoghs Posted September 25, 2015 Author Share Posted September 25, 2015 What about recovery ? keyboard should work at start up. After you power up iMac pres alt key to boot into recovery mode. There you have terminal. you can copy backup kexts to /System/Library/Extensions/. repair permissions. After reboot press SHIFT key to boot in SAFEMODE. No it doesn't , my keyboard doesn't work on startup. Link to comment Share on other sites More sharing options...
PippoX0 Posted September 25, 2015 Share Posted September 25, 2015 Try a recovey USB/DVD . If it doesn't work ... You will presume an HW failure. Link to comment Share on other sites More sharing options...
LouCioccio Posted October 2, 2015 Share Posted October 2, 2015 Yves, "I can see the iMAC over the network but have only turned on File Sharing unfortunately. Using my MacBook Pro I can browse to the /System/Library/Extensions directory on my iMAC, but cannot delete the corrupt IOUSBFamily.kext file and replace it with the backup one due to permission issues. I've tried SSH-ing to the iMAC but SSH is turned off." 1. Do you use the same username/password on the MBP as the iMac? If not why not creat a new user on the MBP with the same username and password that was on the iMac with admin privileges. I wonder if you then you can chmod and chown /System/Library/Extensions directory delete the corrupt IOUSBFamily.kext file and replace it with the backup one and still bless it from your MBP. Just a WAG! You are in deep so what do you have to loose. Ciao, Lou Cioccio Link to comment Share on other sites More sharing options...
Yves Hertoghs Posted October 20, 2015 Author Share Posted October 20, 2015 No it doesn't , my keyboard doesn't work on startup. Actually it DID work, so sorry about dismissing your answer! Link to comment Share on other sites More sharing options...
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