Will not start up
Lost power and unit shut down from sleep mode. Push button on back and hear sound of starting up, then nothing. Tried button and 4keys, but not doing something correctly.
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Chosen Solution
Rep: 385
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First, try unplugging the Mac from the wall for two minutes and plug it back in. Try restarting. If that doesn't work, attempt booting in "Safe Mode" by booting up and as soon as you hear the startup chime, press and hold the "Shift" key until you see the Grey Apple and Spinning Gear. Then let go. Starting in Safe Mode fixes a couple things, so try the unplug first. Works so many times after power has gone out. Another possible fix is resetting the PRAM.
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Most Helpful Answer
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Hello,
as I read this trouble I realized that this was the same I had this week with my iMac 2411. In my case I exchanged the small PRAM battery CR2032. Now everything works correct. The instruction to change the battery is already written in iFixit.
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