So I got my R9 290 4GB yesterday, I put it in my PC, and it didn't work. It has 2 green lights (LED 1 and 3) and a red on LED 2. I read, that a 550W power supply won't be enough, so today I bought an EVGA 750W Gold Plus 80 rated PSU. I put it in, connected with both connectors (8 and 6 pin) and it still doesn't work, it has the same lights. I didn't find anything about the LED lights, or meanings. CNA somebody help? I put it in another system, and had the same problems. Thanks for the help.