TI v10, new build 4949. Must the CD be blank and never used before, i.e. totally NEW? Why do I ask? I only have experience from the first TI v10 issue, but I forgot how I did the bootable CD then. I have .ISO file, so perhaps I used that. Just can't recall. In any case, now with the new build, following the advice in the manual, I made a new one. I let TI write directly to CD-RW. Brand new one. That worked. It booted fine. It made subsequent backup image. It validated just fine. BUT, then I tried the .ISO route. AND I also REUSED a previously made good, Acronis disk. The CD burn was by some Sonic utility that came with my PC. I told Sonic, when asked that the disk contained data, to erase. It then recorded the ISO file. THAT DISK WON'T BOOT. Neither will one other trial over a previously recorded disc. What did I do wrong? The .ISO part or reusing the disc?