Hi all, I'm new to the forum. I'm at my wit's end with this new system I bought. Well, I say new.. I got it about 5 months ago and have had problems ever since. I built the system myself and in the 13 years I've been doing this, I've never seen anything like it. Here's the time line of what has happened: Initially bought: Gigabyte P35C-DS3R mobo 2x1GB Crucial Ballistix PC2-8500 RAM Antec P182 case Hiper 580W PSU Intel Core 2 Duo E6600 CPU - After random crashes/BSoD in both WinXP64 and Vista32 I sent one of the RAM sticks back. - No joy with the replacement so sent motherboard back. - No joy with new motherboard so sent other stick of RAM back. - No joy with new RAM so bought 2 new Hard Drives - No joy with new Hard Drives so bought new PSU (Zalman 600W) - No joy with new PSU. At this point I thought that the 2nd RAM stick I sent back was the wrong one so sent the right one back. Also the motherboard went into an endless powerup/down cycle. Checked the Gigabyte forum and found this is a problem with the board. So I got a refund on the motherboard and went out and bought an [MSI P35 Platinum], which is my current board. - The new motherboard has been running on 1GB for over a week completely stable. - New RAM stick arrived yesterday and after 5 minutes of operation....BSOD!!!!!!!! AGH!!!! :'( In the BIOS, I have set the RAM voltage to 2.2V and the FSB to 1067MHz, these are the Crucial manufacturer's optimal settings. Interestingly, if I set the voltage to Auto it detects the RAM speed as 800MHz... Also, if I run CPU-Z it detects the RAM as PC2-6400!!! Please someone help me, I'm at my wit's end with this thing. I have changed everything except the CPU and Graphics Card (8800GTS). Basically if I run it with just one stick of RAM in, it runs stable. If I put a 2nd stick in, it crashes (usually when under load, like in a game). Thanks in advance for any advice.