AsRock h55m-LE won't boot up with 2x4G DDR sticks

Hey,

I just got a brand new mobo, AsRock h55M-LE. I got KHX1600C9D3K2/8GX (2x4GB) 1600MHz DDR3 CL9 XMP memory sticks. When I try to boot up with one stick which is in slot DDR-B, the comp works. If I put another stick in DDR-A, comp boots up for 5-7 seconds and reboots. I use only one stick in DDR-A it's gonna be same error. So atm only DDR-B with one stick works.

I tried to change timings and voltage in BIOS and result was this:

9-9-9-27, dram volt 1,65, vtt auto and both sticks in boots up for 5-7 secs and reboots (there's no pic in monitor etc)
9-9-9-27, dram volt 1,65, vtt auto and one stick in everything works.
9-9-9-25, dram volt 1.5, vtt auto and two sticks in comp boots and stays on but there is no pic in monitor or any light on keyboard etc..
9-9-9-25, dram volt 1.5, vtt auto and one stick in everything works.

And also tried to change dram frequence but it's the same with all.

I have tried both sticks and they both work.

Is there something else I can try to change? Or could it be it's just the mobo that's broken? Tho I found that ppl had similar problems with this mobo, but there wasn't any solution.