I have an Intel dG43RK motherboard, bought new and sealed, and have tried two different brands and speeds of RAM with a 3-beep BIOS indicating a memory error, which also occurs without RAM installed (as it should).
The memory tried is;
1x4GB 1333 Kingston HyperX DDR3 RAM (New and Sealed)
2x4GB Team Elite 1066 DDR3 RAM (New and Sealed)
I have tried multiple configurations and seating layouts and still no luck. I also have a GT520 graphics card on board as I dislike in-built graphics in most cases and had it at hand (also new and sealed). The only used parts are the CPU, which worked in my previous tower and was directly taken from the PC into the new set-up and the CPU Fan which will be replaced with a new fan in the foreseeable future once this is resolved.
I've run out of ideas myself and any help is appreciated.