Unhappy noisy pixel ed colors screen on startup my i1900g

first,i installed a custom root on my i1900g,and now on every startup or restart,the first screen that appear when starting the device shows a noisy colors (as old tv channel screen when closed at night ,but this pixels not in white and black but its colored ).

this appears time is few than 1 second then >>appearing the samsung s2 logo >>then normal booting and every thing is ok in all objects of the device.

so my question is (( this means i must change the screen ?? or there is any way to solve that ??

and thank you very much.