crwdns2936637:0crwdne2936637:0 crwdns2853008:0crwdne2853008:0 crwdns2918746:0crwdne2918746:0
crwdns2918538:0crwdne2918538:0

crwdns2934243:0crwdne2934243:0 mayer

crwdns2934249:0crwdne2934249:0:

Replace the old RAM first and get the machine running. Next replace just one stick of the new RAM and see if it works. Now try the new stick in the other slot. This checks both the RAM and the slot. Repeat with the second stick.
Are you getting any beep tones?
UPDATE
RAM Type:PC3-12800 DDR3LMin. RAM Speed:1600 MHz
Details:Supports 1600 MHz PC3-12800 DDR3L SDRAM SO-DIMMs (204-pin).
Standard RAM:4 GBMaximum RAM:16 GB*
+
+https://everymac.com/systems/apple/macbook_pro/specs/macbook-pro-core-i5-2.5-13-mid-2012-unibody-usb3-specs.html

crwdns2915684:0crwdne2915684:0:

open

crwdns2934245:0crwdne2934245:0 mayer

crwdns2934249:0crwdne2934249:0:

Replace the old RAM first and get the machine running. Next replace just one stick of the new RAM and see if it works. Now try the new stick in the other slot. This checks both the RAM and the slot. Repeat with the second stick.
Are you getting any beep tones?
+
+UPDATE
+
+RAM Type:PC3-12800 DDR3LMin. RAM Speed:1600 MHz
+
+Details:Supports 1600 MHz PC3-12800 DDR3L SDRAM SO-DIMMs (204-pin).
+
+Standard RAM:4 GBMaximum RAM:16 GB*

crwdns2915684:0crwdne2915684:0:

open

crwdns2934241:0crwdne2934241:0 mayer

crwdns2934249:0crwdne2934249:0:

Replace the old RAM first and get the machine running.  Next replace just one stick of the new RAM and see if it works.  Now try the new stick in the other slot.  This checks both the RAM and the slot.  Repeat with the second stick.

Are you getting any beep tones?

crwdns2915684:0crwdne2915684:0:

open