iMac Mid 2011 taking forever to boot up after clean install of MacOS Sierra

beaupatrice

macrumors newbie
Original poster
Oct 20, 2016
10
0
Hi,

I came here to find some help with booting issue on my iMac.

I decided to start fresh and installed macOS Sierra after formatting hard drive on my 2011 iMac. I have 5 external hard drives connected and it takes 4-5 mins on white screen before showing apple logo and progress bar. If I disconnect all external hard drives then system boots up normally.

I am not sure what to do. I have done following trouble shoots without any success.

1. Cleared PRAM by holding Ctrl+Opt+P+R at startup.

2. Point to Macintosh HD under 'Startup Disc'

I think the problem is that my iMac is looking for boot device when I plugged external HDs.

I will appreciate any help.

Thanks, Beau
 

hfg

macrumors 68040
Dec 1, 2006
3,566
276
Cedar Rapids, IA. USA
Once you are booted into OS X ... check SystemPreferences/StartupDisk and set it to your boot volume.

Although pointing to it should work, I always perform the full reboot from there to be sure it is set.
 

beaupatrice

macrumors newbie
Original poster
Oct 20, 2016
10
0
Once you are booted into OS X ... check SystemPreferences/StartupDisk and set it to your boot volume.

Although pointing to it should work, I always perform the full reboot from there to be sure it is set.
Thanks hfg, I already tried that but still same problem. I am not sure why it is taking time to boot up with external HDs plugged. I didn't have this problem before.

Thanks
 

hfg

macrumors 68040
Dec 1, 2006
3,566
276
Cedar Rapids, IA. USA
I assume your boot drive is internal? Are all your external disk drives USB, formatted OS X and in good health?

I have a 4 disk Thunderbay 4 on my 2014 5K iMac with internal SSD and it boots quickly with or without the external drive bay attached.

If your boot drive is a rotating hard disk, Sierra is generally known to be "sluggish" on non-SSD hard disks. However, a 4-5 minute boot time does seem to be excessive!
 

beaupatrice

macrumors newbie
Original poster
Oct 20, 2016
10
0
Yes my boot drive is non SSD internal drive. I have no issue booting my system without external HD connected. The problem is when I connect my external drives.

I am using these external drives for the last few years without any issue but ever since I reformatted my system to install clean copy of Sierra, the problem started.

Thanks
 

Taz Mangus

macrumors 68040
Mar 10, 2011
3,285
375
Yes my boot drive is non SSD internal drive. I have no issue booting my system without external HD connected. The problem is when I connect my external drives.

I am using these external drives for the last few years without any issue but ever since I reformatted my system to install clean copy of Sierra, the problem started.

Thanks
Try just hooking the external HDs up one at a time. Try connecting the external HDs to another Mac computer and see what happens. Another thing you could try is doing a SMC reset. Also try this, shutdown the computer. Hold the option-key down while booting. When you see your boot devices, select your internal hard drive.
 

beaupatrice

macrumors newbie
Original poster
Oct 20, 2016
10
0
Try just hooking the external HDs up one at a time. Try connecting the external HDs to another Mac computer and see what happens. Another thing you could try is doing a SMC reset. Also try this, shutdown the computer. Hold the option-key down while booting. When you see your boot devices, select your internal hard drive.
Hi Taz, I will try SMC reset and if that doesn't work I will try plugging one drive at at time. unfortunately, I don't have access to another Mac.

thanks