Hello all and I apologise in advance for posting what might appear to be a very common topic.....but I have tried everything I can find by way of advice and am still having no joy. When pwering on my iMac, the white light on the lower right hand coner illuminates, there is a very short buzzing noise i.e HDD/fan and then the optical drive starts spinning....I have the original apple boot disc in there. I do not seem to be getting any response from powering on whilst holding down C, in fact I am not sure keyboard or mouse (wireless) are connecting. I cannot eject the disc in the drive by either holding down mouse or eject button. I have removed and subsequently reseated my RAM but seen no obvious change. I get no startup sound upon power on.....effectively I am seeing very little in terms of response from the machine. Does anyone have any ideas? I seem to have power but it clearly isn't booting and I have no visual interface.....? I replaced my HDD drive apporx 6 months ago and all had seemed to be going fine so would assume this is not an issue? Any adivce would be greatly appreciated........ Thanks in advance!