Hello i have 11.2 iMac and i installed 16 gb ram it beefs and doesn't opens

hello i have 11.2 iMac and i installed 16 gb ram 4x4 corsair  1x204 pin ddr3 1333mhz but when i installed and open my computer it beefs and doesn't opens how can i solve this problem i installed old rams again ant it works fine

Go to a site from Mac specialists such as Crucial or OWC, http://www.macsales.com and find the ram for your iMac and see what they recommend.  Then compare with what you installed, you said Corsair, and see if it matches.  You need to send the ram back you bought for a refund or for replacement with the correct ram or ram that will work.
dwb is correct, either you bought the wrong ram or the ram is defective.  Either way it will not work.

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