Screen flickering after booting?

Dear All,

1st After booting the screen goes blinking red, blue and white.

I opened the display casing, remove display cable, power inverter cable and cleaned up everything with contact cleaner, reassemble and turn on...it back to normal good display.

2nd next day, I boot up and get into root screen to remove old password and did hard dics check suddenly it goes flickering again.

3rd I tried to do 1st step but it wont goes normal good screen again.

Does anyone can help me?

I already re-arrange the display cable on logic board and cleanup everything with contact cleaner, but still the same flickering.

Thanks before for your help.