Hi All, I'm at wits end and hoping someone can help me with this. I've got a system setup that I've had running for about a year, and through that time upgraded sme components. I currently have Intel Core2 Extreme QX9650 Asus P5Q Pro Turbo [Until 2 days ago it was P5QL-E] 4x 1GB Corsair Twin2X DDR-II 1066MHz 5-5-5-15 [It was 2 Until 1 month ago] ATI Radeon HD4890 1GB WD Caviar Black 500GB [was Seagate 250GB until 1 month ago] Seagate 400GB [D: drive, had it for a few years] LG H55N DVD-RW Linksys Wireless G PCI Card Windows 7 Ultimate x64 I'm running a very fresh install of 7. And my system has been rock solid for a year. When I had my P5QL-E the system ran well, but I had some Crucial Ballistix sticks and used four of them. I started having crashing and blue screens, and ran memory tests only to see bad memory. So I put my 2 corsair sticks back in. Everything was fine. In September I purchased a Radeon HD4980 1GB and then in November a 500GB WD Caviar Black and 2 of the Corsair memory modules I already had, taking it up to 4 x1GB. I ghosted from the 250GB to 500GB and installed the RAM. Everything was great, then 2 days later blue screens etc. I tested RAM and it was bad. I tested each stick and they were all fine. I went back to 2GB and everything worked. I decided to do a fresh install of Windows 7 x64, so with the 4GB Installed it and it was fine. Then more blue screens etc. I stuck with the 2GB until two days ago I bought a new motherboard. I installed the new board because the P5QL-E had one issue I knew about it. That was somebody had installed a 64-Bit PCI card into one of it's 32-Bit slots. The board was actually damaged badly we thought due to the original system it was in was unstable. I tested the board a while later and it was perfect, everything was great. I just thought there might have been an issue with running 4 sticks of RAM. Now I've got the setup listed as above, and for a day it was perfect. No issues. Now I'm starting to have them more often. Blue Screens are random (Pageflie, IRQ and unnamed issues) I'm going nuts. All [pretty much] new hardware, all tests fine now. I can't think of what it is, I even took out my SB X-Fi and it seemed to help a bit. But I'm now writing this while in Safe Mode. My drivers are up to date, windows is too. I've built thousands of computers and fixed thousands of computers. I'm just lost when it comes to my own issues! Oh, my PS is an Antec EarthWatts 500W. Voltages look good coming from it. System crashes under any load really. Prime95 can run for 48 hours, or I can be listening to MP3's for 30 minutes. Thanks for any advice!