The options dont seem to be working. I restarted the imac and immediately after hearing the startup sound i pressed the shift key and held down, after about 15 secs the screen went from black to grey, after about 90 secs went black and straight back to grey but again had the small square in the middle with the 2 smiling faces changing to ? back and forth. note the small rectangle in the centre is about 10mm x 12mm with a light blue strip on top about 1mm high and looks kind of like a battery.
I previously replied that I have tried both procedures with no success, I will follow your advice to go to a service centre. I also advised of lightning in this area on the night the problem started, could this have been the cause. please advise if you have anymore suggestions. I have accepted 1 answer, is this ok or should i have paid more as i have been satisfied that you have tried to help. As i have only just recently obtained my imac and will probably need help at some stage after i have the mac repaired. Thank you