Cannot Upgrade RAM on GA-P55M-UD2

[mantas]

I have GA-P55M-UD2 along with i3 3.06 Ghz. OS is Windows 10 64 bit. Currently have 1 of the KVR1333 (Link Below), so running on a 2 GB RAM.
https://www.newegg.ca/Product/Product.aspx?Item=N82E16820134810

I bought a 1600 (link below) to upgrade the RAM to 8 GB. That made the computer stuck in a reboot-loop.

http://www.memoryexpress.com/Products/MX51493


Bought another set of 2x4 GB RAM (Link below) with no change.

https://www.newegg.ca/Product/Product.aspx?Item=N82E16820239613


Do I need make any changes in BIOS settings to make this work ?
It should have worked with both the RAM as mentioned at Gygatbyte website.

_{Memory   
4 x 1.5V DDR3 DIMM sockets supporting up to 16 GB of system memory
Dual channel memory architecture
Support for DDR3 2200/1600/1333/1066/800 MHz memory modules
Support for non-ECC memory modules
Support for Extreme Memory Profile (XMP) memory modules
(Go to GIGABYTE's website for the latest memory support list.)}

https://www.gigabyte.com/Motherboard/GA-P55M-UD2-rev-11#sp

[shadowsports]

I don't think either of these kits are on the QVL for the board.  Most appear to be 2/4GB.

Have you tried setting timings and voltage manually?  XMP may not be supported in this case.