Model A1312 / Mid 2010 / 3.2 GHz Core i3 or 2.8 & 3.6 GHz Core i5 or 2.93 GHz Core i7

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Same RAM removed & replaced now not working

I took out one RAM from the slot, being nosey, put the original RAM back in. Now my iMac starts but won't get to the chime stage and has a black screen. I have no keyboard control either as it doesn't reach that point. It's a 27" iMac i5 mid-2010. Help please.

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I have pushed them both in until they clicked. Seems like the iMac isn't seeing one. When I was turning it off it came up with a box showing the four slots but only one was showing the RAM in it's slot. Can RAM get damaged by just doing this?

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I suspect you put the modules into the wrong slots. There are four slots Bank 0 and Bank 1 (Left & Right). You do need to finish the bank (slot on the left and right on either the top or bottom bank).

Here's a Apple T/N on: iMac: How to remove or install memory

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And yes you can damage the modules with static electricity so be careful!

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Karen will be eternally grateful.
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