For 3 hrs, everything works. You can always run this unit externally to a screen, but fans will go full speed with no screen. Monterey (Current OS) installed on a 120GB SSD (Pass 1234). Unit back has scuffs on. Sale is for Imac only.Great Imac for everyday use. This item is in the category "Computers/Tablets & Networking\Desktops & All-In-Ones\Apple Desktops & All-In-Ones". The seller is "west-island-electronics" and is located in this country: CA. This item can be shipped to Canada, United States.