problem re-seating the Graphics card on the logic board
this is my second question on the same problem. i was able to successfully recover the use of the display after removing the logic board and heating and re-seating the graphics card. However,i have done this twice now and each time the 'fix' only lasts for a few hours and then the screen suddenly goes black. question; how hot should i be getting the graphics card in order to permanently re-seat it so it will stay fixed.