I built this rig two days ago: Motherboard: Asrock 870 Extreme3 CPU: AMD Phenom II X2 560 Black Edition Callisto 3.3GHz (With 2 extra cores unlocked) Memory: A-DATA Gaming Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) OS: Windows 7 Ultimate HDD: WD Caviar Black 640GB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Graphics: Sapphire 100283-3L Radeon HD 5770 1GB 128-bit GDDR5 PCI Express 2.0 x16 PSU: Antec Earthwatts 650W Monitor: ASUS VH236H Black 23" 2ms(GTG) HDMI Widescreen Full HD 1080P I set it up and got it running with no issues, installed all of the drivers that windows update could find, then got the newest CCC from AMD. Here's where the issues started: I tried using AutoTune on AMD Overdrive to overclock the graphics. As soon as I clicked it it went to a screen with vertical green and red lines, stayed there for a few minutes, then I got the message no signal from the monitor. Everything in the computer was still running, including the graphics, just no signal. I rebooted. Somewhere along the way I also oc'd the CPU using an auto function on the Asrock BIOS. I immediately set it back to default though. I gave up on overclocking and tried to play BFBC2. It did the same no signal issue anywhere from 5 to 30 seconds into the opening cinematic. The audio would keep going for 10 seconds after the video went, then it would make weird noises and cut out. When I play less graphics heavy games (Guild Wars) it can last around 30 minutes before losing signal. I tried 3DMark06 a few times. The first few it got to the firefly forest, where it lost signal. When I lowered the resolution it got to the fourth graphics test, but didn't finish it. Of course I suspected overheating, but using Speedfan and the CCC temperature monitor, I found it to be cutting out at no higher that 56 C, with the CPU at 52 C. I tried all both ports on the card, DVI and HDMI. I've tried pretty much everything I can think of. I reinstalled the drivers, using the ones from the disk instead. I pulled out the card and put it in a different slot. The weird thing is, an almost identical problem was the reason I gave up on my old machine (which I didn't build). If anyone can help me, even if you just tell me to RMA it, that would be awesome. Thanks.