Hello, I posted this over at the Guru3D forums but haven't got an answer. So I thought I could try over here I've been having this problem which appeared randomly the last week after having my system running perfectly for about 3-4 months. During any benchmark or game the pc will crash without a BSOD after about 2-3mins. Only way to recover is a hard reset. This happens all the time and randomly a game (or benchmark) will go on for a bit longer, say 10mins. On top of that, CCC crashes when I try to open it (actually it says the CLI is the cause). Under 2d usage everything works fine, even system demanding tasks. A few things I should make clear: * I've got latest Catalyst installed. * .NET 2.0 Framework installed * I've tried flashing back the card to a Pro with the same results * I've tried maxing the fan speed with ATI Tool. Same results. * I've done a clean WinXP install. Yep, same results. My temps are: * Idle GPU: ~51 * Load GPU: ~75 * Idle CPU: ~40 * Load CPU: ~55 Any idea what's going on anyone? PS.I've also noticed my PSU makes some fairly high chirping noise whenever the cpu or gpu is under load. Could that be a sign of a failing psu or is it just some load noise I shouldn't worry about?