Currently Being ModeratedMay 25, 2011 7:04 AM (in response to Cws5214)
My MacBookPro5,3 (June 2009) machine just started the occasional blink, also.
There is a massively long discussion here, most people with late 2008 models, some with 2009 models:
The conclusion appears to be that the only real fix is having AppleCare, and getting a replacement model.
I sure hope that this is not the only solution (and I hope it is not a degenerative problem, because my blinks are rare and not too annoying).