Startup delay after upgrading HD in 2012 iMac

The other day I replaced the 1 TB 5400 drive in my 2012 21.5" iMac with an SSD. The speed increase is really noticeable, but I note now that there is a 15 sec delay between the time I start up the Mac and the time the Apple symbol appears. There was no such delay before; it's almost as though the Mac is looking for my drive. I check on System Preferences that the drive is selected as the boot drive. The Mac is running the latest version of Yosemite.



Any idea how I can fix this?

via ehMac.ca http://ift.tt/1zBNedt