Hello, I'm new here but would like some help with my iMac, would be much appreciated. So this is my computer: iMac Aluminium 20" 2.4GHz Intel Core 2 Duo 1GB / 250GB / SuperDrive / AirPort Extreme / Bluetooth / ATI Radeon HD 2400 XT 128MB which I bought in end of 2008 so it's quite old already. It's worked we'll until today when I tried to start it and received a message with a blinking question mark in a folder. I have been reading other people's responses here and have tried booting the disk, reinstalling my operating system, the PRAM thing and nothing seems to work. I can access disk utility when I insert the reinstallation DVD but it still doesn't find my harddrive so I can't repair it. Does anyone have any other suggestions on what I could try or has my harddrive completely failed? I should mention that I've backed up my important stuff so I'm not too fussed about recovering lost files just want the computer to work again. So my second question is, if the harddrive has failed is it worth replacing it in a computer 4 yrs old? And if so does anyone have an idea on how much I should expect to pay? Thanks so much really appreciate any help!