Getting Started With macOS Sierra Setting Up Mac OS X 10.12 Finder Tour File Management Window Views Managing Files Advanced Finder Techniques Searching For Files Storage Devices & Media Backup & Recovery Features Multiple Users Time Machine
Using Applications Application Basics Standard Menus App Store Textedit Address Book iCal iTunes Quicktime Other Small Apple Applications Dashboard Desktop Management AirPlay Photos (formerly iPhoto)
Mac OS Utilities Fonts Printing Disk Utility Other Utilities Network & Internet Connectivity Networking Connecting To The Internet Internet Applications Firefox Optimization Chrome Optimization iCloud Customizing Your Mac Customizing The Finder Customizing Finder Windows System Preferences
My iMac sometimes became unresponsive. Also, the key chain was always popping up to ask for my password. They looked at computer and discovered that I had a hard drive problem. They replaced my hard drive with a solid state drive. They fixed my key chain issue. Now my iMac works GREAT. With the new hard drive, I am certain I will get many more years out of my iMac as it runs super fast now. Thanks for all your help.