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Asus P8H77-M PRO motherboard doesn't detect 2nd ram stick

Hello everyone, i hope someone could help me with this one.

 

My problem is that when i install the second ram stick the monitor doesn't show anything, instead there's a DRAM LED just showing a red light on and off. The ram sticks are installed in DIMM A2 and B2 as the manual said, and i already pressed the MemOK! button but i still have the same problem, nothing appears on the monitor. 
The only time it boots to Windows is when i have a single ram stick and it works normally(on slot A2). Also i had another PC with the same cpu and ram and it worked perfectly with 6gb of ram (i'm have at the moment 2x1GB and 2x2GB). Any thoughts on what could be the problem?

 

Thanks for reading!

Temporary using a Dell Inspiron 14" laptop:

CPU: Intel Core i5 6200U | Memory: 8GB DDR3 | GPU: AMD R5 M315 2GB  | Storage: Western Digital 1TB 5400RPM

 

CPU: Intel Core i5 3570k | Motherboard: Asrock H61M-DGS | Memory: 8GB 1600MHz DDR3 | GPU: MSI GTX 650Ti Boost 2GB | Case: NZXT Source 210 | Storage: Samsung 1TB HDD | PSU: Seasonic X-Series 650W

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