Ok I replaced my Imac g5 logic board because I had popped caps on the board I was having video issues -- After replacing the board the computer still has video issues video gets blocks on the screen or lines on the lcd -- i have outputted to a monitor and does the same thing or I get kernel panic -- I sent back the board and got a new one but still does the same thing -- I was checking the heat and I think it could be the power supply ?? Not sure where to look