New hardware, red VGA LED

I just bought some new hardware:

SSD: Samsung SSD 830 Series 256GB (SATA 6 Gbit/s)
CPU: Intel Core i5 3570K (LGA1155)
CPU-kjøler: Thermalright HR-02 Macho
MB: Asus P8Z77-V PRO
Mem: G.SKILL Ripjaws-X 16GB DDR3 (4x4GB) 1.5V F3-12800CL9Q-16GBXL

When I turn the computer on the VGA-LED is red (no picture on monitor). Sometimes, when the VGA-LED is not lit, I get an USB-error.

I've read that these kind of problems can be related to memory and mainboard incompatability, however both productsheets in my case show that they support eachother

I've tried:
- boot with only 2 of 4 memory modules, without luck.

Does anyone have an idea how I can begin solving this to get it running stable?

I'm kind off lost to where I should begin, and what can be the cause of this. This makes it hard to google aswell, so I'm asking you guys! :)
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  1. Updated BIOS to latest version.

    The USB-error looks like this:
    USB device over current status detected !!
    System will shut down after 15 seconds.

    I also got another error, that have only showed up once:
    The VGA card is not supported by the UEFI driver
    CSM (Compatability Support Module) settings have been changed for better compatability
    For further adjustments, press [F1] to enter BIOS setup.
    If no adjustments needed, press [F2] to confirm the current settings and enter OS directly.

    The problem still persists
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