iMac will not boot, grey screen, chime, apple logo, switches off
My 5 year old Mac will not boot and get past the grey screen. I hear the chime, apple logo appears, spinning wheel keeps spinning but progress bar doesn't progress and sometimes if just switches off. I've tried soft boot but nothing. I've disconnect everything except keyboard, turned on and off, power from other sockets but nothing.... Please has anyone got any other ideas?
iMac