In 2007 I purchased my LiveTracker II by Sonica as my audio / video computer. It was setup by Sonica to have as few additional programs installed to make audio & video creation / editing as problem free as possible. I use ACID for audio and Vegas for video so I'm true to the Sony school here. I have had five good years of relatively problem free usage but all of a sudden when I render a project in Vegas 10 (or 8) the project gets to about 70% and then the computer just shuts down. No blue screen, no message of computer crash when restarting, it just shuts down and obviously I'm not getting my work done. The audio will render fine but the video is a challenge most of the time. Since this first occurred a couple weeks ago it has finished the job a couple times, once on a big project that required compression, but most of the time it shuts the computer down, Has anyone ever had a problem like this that might give me guidance as to how I might correct it? I'm able to move the file to my desktop and finish so it's not the file. I know it's hard to say without seeing the computer but maybe there is some detail that I might be able to fix with some advice. Please help if you can.