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I have an iMac and the hard drive failed. Do you have a step-by-step guide for a novice to follow?

I tried that – everything seemed to go smoothly. When I started my computer (with the Snow Leopard disk), I got an initial chime and black screen. I heard the hard drive whirring like it was trying to read the new hard drive. No Apple symbol, no nothing. I tried rebooting holding the C-key – still nothing.

We don’t know which iMac you have. Here’s all of them iFixit has guides for. iMac Repair