Question I need compatible ram for asrock z68

Apr 17, 2018
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I have tried to upgrade from 2x2GB to 2x4GB . The 4GB (2x2GB) are in slots B1,B2 as no other conbo will work, just dr debug 55. The 2x4GB tried1 in every slot gave error 55 tried both in every combination same error.These 2x4GB work in other machines. Ram is 4GB Hynix 2R8 PC3 12800U.MB is asrock z68 gen3 ext3. this is driving me nuts. Have also tried single Kingston 1x8GB. same error.
Thank You