Q: iMac takes 22 minutes to start with USBs plugged in
iMac Retina 5k 27" i7 32/1.12gb Fusion Mac 10.10.5
Starting with Option key, get the normal chime, and takes 22 minutes for the boot manager to show bootable Mac or Windows partitions. This is with hubs/devices in 3 USB ports, and eSata adapters in 2 lightning ports. With just the keyboard plugged in, it takes about 15-20 seconds to get to the bootable partition screen. Once at the screen, either way, computer runs normally.
I have never had to unplug things to start a computer normally. What's up?
iMac with Retina 5K display, OS X Yosemite (10.10.5), bootcamp Win7 Pro
Posted on Jul 18, 2016 6:24 AM
disconnect the external devices except mouse and keyboard and reset your SMC
Reset the System Management Controller (SMC) on your Mac - Apple Support
then check your system with AHT
Using Apple Hardware Test - Apple Support
reboot and reset PRAM to verify the correct HD is the selected boot device
How to Reset NVRAM on your Mac - Apple Support
then reboot into safe mode
Try safe mode if your Mac doesn't finish starting up - Apple Support
and check the integrity of your hard drive.
Disk Utility (Yosemite): Repair a disk
at this point if you have no issues shut down and reboot normally with the devices plugged, try them one at a time shutting down and connecting and rebooting normally.
if the problem continues you will need to contact the developer of the device(s) that cause the behavior
Posted on Jul 18, 2016 6:39 AM