I have new installed 8 gb ram in to my 2010 imac i3.
It kernel panic when booted, but worked when I start it in safe mode.
It also shows as 12 GB ram. ( 4 Gb original and 8 gb new. )
How can I make it work in normal mode ?
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Safe mode does not utilize the full 12 gig.
I would do the RAM test to make sure it is working.
Here is a link to a very good way to do that.
Download MemTest for Mac for Free
Memtest is from the broader UNIX world and it that has been ported to Mac OS X. For whatever reason, there are some websites who are charging for the free utility, but you should not need to pay for it because it is free, open source, and there are Mac versions available from developers as free downloads: