2009 iMac beeps at startup

[As Seen on TV]

My iMac 10,1 Late 2009 27" iMac Core 2 Duo (E7600) beeps on boot up. Thinking it is the RAM I tried putting each two (2x4GB) 8GB G.Skill FA-10666CL9D-8GBSQ kits into each memory slot. All two (2x4GB) 8GB G.Skill FA-10666CL9D-8GBSQ kits works on the originally unused slots. The slots occupied by the default memory from Apple will not accept any of the two (2x4GB) 8GB G.Skill FA-10666CL9D-8GBSQ kits.

Should I consider resetting NVRAM / PRAM?

 

[penguintech]

Reset PRAM / NVRAM then try again. it's possible the slots or the ram may be bad.