Installed new RAM. Won't work properly. Help.

[StarSolitude]

Motherboard: MSI P55-GD65
CPU: Core i5

Current RAM: 2*2Gb (Geil)
Attempted RAM installation: 1*4Gb Corsair XMS3 DDR3

Aim: 8Gb of RAM

- When XMS3 RAM inserted, PC either: 1. Won't boot, 2. Continually reboots before entering BIOS or 3. Boots but only acknowledges 2Gb of RAM.
- The results differ depending on which slot I put the new 4Gb stick into
- When installing the 4Gb stick on its own, the system runs and acknowledged 4Gb.

Also.

After trying to install this RAM, I experienced monitor/display problems. Windows no longer recognized my monitor, and the resolution reverted back to 1074x768, with several-inch thick black borders along the sides that my mouse cursor could not enter. Interestingly, my graphics drivers were unaffected. I could not select 1920x1080 as a resolution.

1. How can I get my motherboard to run all three sticks of RAM simultaneously? I don't understand how RAM latencies work. Please explain clearly, if possible.

2. I don't understand how changing RAM could lead to aforementioned monitor/display problems.


Thanks.

 

[StarSolitude]

Hmm I see. I suppose I'll just have to go mad and buy another 4GB stick. Sounds like the easiest option.