AMD's latest ATI Radeon HD 5000 series is indeed selling like hotcakes. Only three weeks ago, AMD had announced that it had shipped two million DirectX 11 GPUs. However as history has taught us, new products sometimes mean new issues. Since the official launch of the HD 5000 series, there have been many lockup reports on several forums. This lockup happens mostly during 3D mode and is accompanied by vertical stripes appearing on the screen (But sometimes it appears as a black screen) and looping sound. So far, we haven't found any information on AMD's website, but luckily one of our systems was affected and it allowed us to investigate this issue.