Two issues: iMac randomly reboots after watching Netflix, and left fan randomly turns on

Two issues: iMac goes into kernel panic and reboots after watching Netflix in HD, and left cooling fan randomly starts. Is this RAM or logic board?
Specs:
Model Name:          iMac
  Model Identifier:          iMac12,2
  Processor Name:          Intel Core i5
  Processor Speed:          3.1 GHz
  Number of Processors:          1
  Total Number of Cores:          4
  L2 Cache (per Core):          256 KB
  L3 Cache:          6 MB
  Memory:          20 GB
  Boot ROM Version:          IM121.0047.B1F
  SMC Version (system):          1.72f2
The fan issue has been there for a while, but the kernel panics, AKA crash and reboots started after I got new Crucial RAM for the 2nd time (returned and replaced the two 8GB sticks, because the crashes were worse).  Are the chances that I got 2nd batch of RAM likely, or is there logic board issue here?

You should post the most recent panic report. http://support.apple.com/kb/TS3742

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