fujitsu siemens amilo pro 2727 fn f1 key not working

Can't explain why Fn + F1 doesn't work, but reinstalling the wireless driver might turn WiFi back on, has to be worth a try.

Failing that, might be faulty F1 key. Try this:

1) Open NotePad or WordPad
2) Press F1 on it's own

It should open a new window for Windows Help & Support
If it doesn't, the F1 key is faulty.