I've spent all day assembling my first PC build. It certainly wasn't easy .. the graphics card really doesn't fit in the case (but I got there in the end) and my CPU cooler wouldn't tie down properly.
Anyways, I got it all together. I've tried my very best to plug everything where it should go (I'm very novice, so I wasn't 100% sure). Now, when I turn on the PSU, a red light appears on the 6870. And when I try to turn it on, absolutely nothing happens. What should I do?? :S
Case/PSU: CoolerMaster Centurion 5 II With 500W PSU (Black)
No, a red light is not a good sign. It usually indicates you've either forgot to plug in all the required power connectors or the PSU isn't up to the task of running the GPU. Your GPU requires both 6-pin PCI-E power connectors to be plugged in.
The checklist in my signature was created to troubleshoot this type of problem. Perform EVERY step in the checklist and let us know how it goes.
One beep indicates a successful POST. Which output port are you using on the GPU? Have you tried both DVI ports? If you're using HDMI, have you tried both of them? It sounds like you might just be plugged into the wrong output port if you're getting a single beep from the system.
There is no 4-pin GPU power cable. The PCI-E power connectors have 6 pins and you have to plug them both in. Is the red light still lit up on the GPU? What 500W PSU do you have? Does it have 2 6-pin PCI-E connectors?