Hi there I suspect that my 11 year old G5 iMac is dead and will not rise again. I have the start up bleep, accompanied by loud fan noise, and the ambient light flashes but the screen remains black. I have eliminated a power supply issue by going through the diagnostic on an old Apple help board. The inside looks clean - there is no sign of corrosion nor an accumulation of dust - and the hard drive and ram were upgraded several years' ago. A quick google search suggests that the graphics card might be the problem and, if so, is there any hope or point, from a cost perspective, of getting a replacement? Might there any other explanation(s)? If all is lost and I have to consider a replacement - it will be a used model - what should I specifically avoid? Thanks people.