OK, I'm slightly worried. I was just checking my email on my G5, when all of a sudden it made a crackle sound, followed by a loud bang/pop. The machine went dead and the room then filled up with a smell of which I can only describe as 'gunpowdery' (kind of like a party popper). I checked the fuse on the plug and that had blown. So I replaced it. I powered up my machine - everything looked good. It made the startup chime, started to boot - then BANG! Same thing happens. More gun powder smell too. I opened the machine up and it appears that the smell is emanating from from the CPU enclosure. Help! Does anyone have any idea what this problem is? Overheating CPU's? Many thanks.