ram upgrade works in safe mode but not in normal mode 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 ?
First thing is to simply remove and reseat the chips. Restart, zapping the P-RAM as you go - might be surprised to find it's all okay.