External keyboard does not have Fn, I want to switch screens
Solution 1
If you are using Windows 7 or 8, you can press Win + P to switch the second monitor output.
If these keys on your keyboard, unfortunately, don't work either, right-click on the Desktop, select "Adjust screen resolution", then press "Connect to projector" link near the bottom to do the same thing.
Solution 2
I believe most Fn keys are driver dependent. If the driver of the keyboard and the driver of the graphics adapter don't interact with each other, this will not have any useful effect. The Fn key on an external keyboard can generally not perform the calls of the laptop keyboard because the Fn keys are hardware specific; they are not regular keyboard keys and can't be remapped.
More information on the workings of Fn keys in this Wikipedia article.
Instead, my recommendation is to check the graphics adapter driver's settings for a hot key section. Most driver packages have one.
There you should be able to set a key combination manually. It's also possible a combination is already set by default.
Here is an example of such a section from my extremely mediocre onboard Intel card:
Solution 3
If you have Windows Vista, 7 or 8 you can press Win+P then choose which screen(s) to use.
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Mark
Updated on September 18, 2022Comments
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Mark over 1 year
The keyboard on my Acer Aspire does not work, about ten keys including the Fn keys do not work. I am now using a wireless Microsoft keyboard which works fine except it has no Fn key. I have bought a S-Video cable to connect to my TV for but I can not use Fn with F5 to get the TV screen on. What do I need to press on this Microsoft keyboard? Please help!
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Dave about 11 yearsBuy a new keyboard any way and plug it in via USB! This would resolve the broken keys and this issue!
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吴环宇 about 11 years@DaveRook: He states he is already using an external keyboard, so I'm not sure how that would help.
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吴环宇 about 11 yearsWe might be able to help you better if we knew specifically which Acer Aspire and which Microsoft keyboard you're using. That way we'd know more about your graphics adapter, for example.
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Dave about 11 years@oKtosiTe, sorry, my first comment is not clear, but I did mean buy a new keyboard with the desired key (you know, one which will solve the issue)!
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Dave about 11 yearsI wonder if AutoHotKey can solve this!
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Alvin Wong about 11 yearsBTW have you tried to actually fix the problem of your keyboard if you can? (Unless that's an "ultrabook")
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吴环宇 about 11 yearsI believe
Fn
keys are driver dependent. If the driver of the keyboard and the driver of the graphics adapter don't interact with each other, this will not have any useful effect. TheFn
key on an external keyboard can generally not perform the calls of the laptop keyboard because theFn
keys are hardware specific; they are not regular keyboard keys.
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Alvin Wong about 11 years@Dave Does Windows Vista have this? I only discovered this shortcut since Windows 7.
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Indrek about 11 yearsAs far as I know, this feature was new to Windows 7.
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Mark about 11 yearstried the windows button with p nothing happens
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Alvin Wong about 11 years@Mark Then what's your operating system? Had you tried my other advice also?