Do you have a link to Amazon RAM?
Macs are very, VERY PICKY about the RAM specs they need.
Most common electronics retailers and wholesalers do not usually have the correct RAM and specs Mac computers need.
Here are the correct specs for RAM your 2011 Mac needs.
32 GB (Actual) 16 GB (Apple) Memory Slots
4 - 204-pin PC3-10600 (1333 MHz) DDR3 SO-DIMM
Also, the timing latency has to be low...9ms or less.
Here is known good and compatible RAM from OWC (macsales.com)
With just the original Apple ram installed try resetting the SMC Intel-based Macs: Resetting the System Management Controller (SMC)
and PRAM About NVRAM and PRAM
Then as noted above return the ram to Amazon and purchase compatible ram from either OWC http://eshop.macsales.com
or Crucial http://www.crucial.com
Ram from any other vendor may or may not be exactly the specs that they list and, as in your case, will cause problems.