On start up I hear the chime but nothing comes on display

On start up I hear the start up chime but can not see anything on display but very vague images

1. Reset PRAM.  http://support.apple.com/kb/PH4405
2. Reset SMC.     http://support.apple.com/kb/HT3964
    Choose the method for:
    "Resetting SMC on portables with a battery you should not remove on your own".
If this does not help, contact Apple.
Bst.

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