I am in need of help with a persistant and unpredictable BSOD problem on my pc. First...the SPEC: CPU: AMD Athlon 64 3500+ Socket 939 M/BOARD: Asustek A8N SLI SE Socket 939 nForce 4 SLI PCI-E ATX RAM: Corsair Memory CMX512 - 3200C2PT XMS3200 512MB CL2 (2 fitted = 1024Mb) GRAPHICS: Connect 3D Radeon X800XL 256MB PCI-E DVI-I VIVO AUDIO: Delta 4/10 PCI (on board sound disabled). STORAGE: 1 IDE Hard Drive, 2 SATA Hard Drives. DISPLAYS: HANNS-G (HC194D DVI monitor) Plus Acer AL 1914 (VGA) History: I built the pc two years ago and it has run endlessly for ages. I use it for audio recording, video editing amd some gaming - ALL OK. However, in recent times I made changes but to be honest have rather lost the chronology of events that may have contributed to this recent problem. Fact: Memory, CPU, M/Board, Graphics card and audio card have been in place all the time. Fact: I added the display (DVI) in recent times Fact: I updated the firmward in my DVD/R drive and didn't disconnect the hard-drives. I immediately had problems with one of the SATA's and had to reformat, repair the boot sector and reinstall windows. Fact: I bought a new (USB) midi keyboard (CME) and installed drivers for it. FACT: I got so fed up with the BSOD problem that I started again by reinstalling windows (XP SP2) and installed latest drivers for everything I could. FACT: I ran memtest for nearly 24 hours - no problems (no BSOD either, strangely enough) Overview of the problem: I'm getting the BSOD very frequently these days....sometimes not at all in one session, another time 5 or 6 times in a couple of hours. It's hard to see what causes the problem. Sometimes it seems to be audio or video related - maybe playing a video file or recording audio. I often leave a large download running overnight and VERY rarely come back in the morning to see that the pc hasn't BSOD'd itself. It's really ruining my enjoyment of my pc and my associated hobbies and would be EVER so grateful of one of you experts could have a look at my dump files and give me some advice. I have already started using WINDBG and have explored the dump files, but despite my best Google inspired efforts I can't make head nor tale of them. I've tried to help myself, but now I have realised my limitations. This is my first post and I am painfully aware that I am asking for help before being able to contribute to the forum in any way - I hope that you will look kindly on me....many thanks in advance!