Diagnostics won't run following the instructions of holding down D at start-up? any ideas

I am having problems with my display and want to run diagnostics - the apple site says to hold down D when restarting and I have tried 3 times but won't go there... Any ideas?
Thanks

LexSchellings wrote:
Startup while holding D is for MacbookAir ! does not work in MBP.
This Apple support article does not make that distinction:
http://support.apple.com/en-us/HT201257
Ciao.

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