iMac went dead, none of the 4 diagnostic led's lit up. After replacing power supply, hear 3 short beeps that continue repeating until I turn off the computer. When first plugged in, diagnostic lite one illuminates, but when turned on, lite #2 illuminates but the beeping begins.
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Here's a good reference on what the tone codes mean If your Mac beeps during startup
From what you describe you have one or more bad RAM SO-DIMM's.
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