I want to mirror two monitors. In the Display > Screen Resolution - dialog box there is a multiple displays drop-down box. The options should be Duplicate..., Extend..., Show desktop ... on 1, Show desktop ... on 2 but I do not get the first option, it's not greyed out it just does not appear. Where is it?

Hi, Have you connect an external monitor to your computer? By default, the multiple displays drop-down list appears when Windows detects more than one monitor connected to your PC. When you plug two monitors into a desktop PC or one monitor into a laptop, Windows 7 should automatically detect each new monitor and provide you with multiple display options. For more information, you could refer to the following links: Move windows between multiple monitors Work and play better with multiple monitors Hope it helps. Regards, Alex Zhao Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.