Imac start up goes to black screen with white writing

My imac on start up comes up with a black screen which has a lot of white writing on it. The mac then stops on this screen and to does nothing else. To re start the computer I have to un plug it. After doing this it will then work fine. this scenario happens about once a month.
Any help would be appreciated.
Thanks in advance.
Regards
Scott.

From reports I've read on here, a PRAM reset is likely to solve the problem:
http://support.apple.com/kb/HT1379

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