Hi! My very expensive Gigabyte Radeon HD 7870 2GB GDDR5 has failed me. I've used it for about 2 years and it always worked really good, but one day my computer wouldn't boot. The computer and fans are running and all but the monitor isn't getting any signal and I'm not hearing the starting beep that I usually hear when everything works. Upon opening the computer I found that the GPU was the problem (a red LED shone under the GPU). When using my older graphics card everything works just fine. I tried removing the memory, then put them back and boot, tried one stick only and the other stick, nothing. I tried resetting BIOS, nothing. My PSU is 500W, and should be enough, not to mention it worked flawlessly for 2 years. Other ppl have had this problem and they solved it by putting the GPU in the oven, but that's the last thing I'd do.