Wireless keyboard fail.....

Hi - I am new to this board so patience please! I have a 2011 iMac, and am having intermittent keyboard issues. I have a wireless keyboard that has partially failed - I can't even log in using it. It seems to be connecting to the mac as I can see output in the password field for some keys (numbers, function keys and direction keys, 'esc' all seem to work) but not others - 'P' works for instance, but not " - its all very bizarre. Has anyone seen anything like this before, and do you have any idea how to fix it? I have the wired keyboard on there at the moment but I know that will **** up soon because there is an issue with the extended keyboard and Yosemite, apparently, and that has failed on me before too!! Any help appreciated....

Many thanks - have tried the resets. The first one didn't seem to have any impact. On the PRAM reset there was no difference in the behaviour of the wireless keyboard (maybe the keystrokes weren't registered as the letters aren't working). With the wired keyboard the mac booted to OS X utilities and then stopped, so I manually restarted. A normal start up occurred but then when I tried to put in my password it looked like the keyboard was on remote control - just went speeding off from left to right and whatever has been out in there can't be deleted as the keyboard is not responding. (Caps Lock not lighting up). Is it really possible that both keyboards are shot, or is it more likely a software problem? I am going to borrow a 'normal' usb keyboard from a friend today to see if that works, but in the meantime do you have any further ideas?

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