I started up my PowerPc G5 the other day, the led at the front flashes, everything seems to start up, but i get no display and the fans run high Things I have done. Reseated and cleaned the contacts of all the ram (8x256) and the graphics card. Reset the PRAM (little button under ram) Taken out CMOS battery and tested voltage, full voltages still. Help? What else can i do?