Question: imac 21.5" 2009 late ram upgrade
I want to ram upgrade imac 21.5" 2009 late but I have got error.
imac is working with Hynix 2GB DDR3 Memory SO-DIMM 204pin PC3-10600S 1333MHz HMT325S6BFR8C-H9 and 1GB ELPIDA DDR3-1333 PC3-10600 SODIMM now.
I bought HI-LEVEL 4 GB 1066 MHZ. DDR3 SODIMM RAM but its did not work on imac
imac gave error alarm and did not start
I want to upgrade from 3GB to 8GB ram.
which ram is correct?