On Startup my mac book pro 15' shows black dots

Hi,

Below dots are coming from last few days......

Steps to cause

1) On boot it shows apple icon, activity indicator and sound aka normal booting sequence

2) Once every loaded apple icon and activity indicator hides and shows the above dots

3) Then after a second it show the login window

-> I checked with http://www.jscreenfix.com that if any pixeks are borken; but it does not show anything.

-> I tried to restart my book as apple hardware test; that is also not poping

Please guide me with solution

Thanks & regards,

Zahur