Wireless keyboard problem

Hi All,
I have a 2011 iMac, which up until a few days ago I could hold down the alt key on startup to bring up the boot options.
All of a sudden this has stopped working, I'm not sure what I've done!! it seems like the keyboard isn't connected until the OS has completely loaded.
I plugged in a wired keyboard and cleared the NVRAM because a friend suggested that might help but it hasn't made any difference.
Does anyone have any idea why this has started happening?
Many thanks in advance....
Steve.

if I were you I would post the issue in the imac forum rather then the ipad forum

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