Using diagnostic mode on 27 inch iMac

I was trying to get my 27 inch core i7 iMac to boot into diagnostic mode this morning by holding down the 'D' key during bootup. It just wouldn't work and kept booting up normally. Then it occurred to me that maybe this is due to the fact that this iMac comes with a bluetooth keyboard. I happened to have a usb apple keyboard around so I plugged that in, rebooted while holding down the 'D' key and voila, it worked.
Am posting this in case anyone else is trying to go into diagnostic mode and can't figure out why it isn't working.

Hey Frank
Great tip, thanks for the heads-up! I've seen that quite a few times when folks are troubleshooting with key commands using a wireless board.
I'm not sure how many folks look, but there is a "User Tips Library" where L2's and up can post tips.
http://discussions.apple.com/forum.jspa?forumID=599
Dennis

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I really expected that there was new cinema display with Retina display, but there wasn't. However, New iMac looks really nice & I would love to buy it.
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Welcome to Apple Support Communities
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IS THE SITUATION HOPELESS
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Graham Giles wrote:
Have you seen this type of problem before? I think it could be a serious issue for anyone in a similar position.
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Hi there,
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Using diagnostic mode on 27 inch iMac

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