New RAM problem with ASUS P5G41t-M SI

[naarsil]

Processor: Pentium Dual Core E6600 3.06 GHz
Motherboard: ASUS P5G41t-M SI
RAM: 2x 2GB DDR 3 Kingston 1066 MHz
64 bit operating system, Windows 7

Hello, here's description of my problem;
So since I got 4GB of RAM, I thought of upgrading for 2 more GB. I managed to buy 1333MHz Transcend DDR3 2GB but when I put it in the black slot in motherboard, next to the blue slot, it wouldn't work (wouldn't boot up, no display)
I have 2x2Gb Kingston, that are in Blue slots on motherboard, and they work perfectly. When I pulled out one Kingston from the blue spot and put Transcend in that place, it worked. So when I mixed Kingston and Transcend each 2gb it worked. When I put in the black slot the other Kingston 2 GB that I pulled out, again, it wouldn't work. Neither black slot. I'm sorry if this was badly explained, I'll explain more if needed. Thank you for your time, and here's the picture of motherboard, so you can see what I mean with "black" and "blue" slot
http://content.hwigroup.net/images/products_xl/090608/2/asus-p5g41t-m-si.jpg

 

[Tradesman1]

Try the 4GB by itself in slot 1, if it works go into the BIOS and raise the DRAM volatge + 0.06, the raise the North Bridge (NB) voltage the same. Save, shutdown. Add the 2GB sticks in slots 3-4 and try