RE: while learning on my own ,per se, I was informed that my CD/RW-ROM is unsigned & will not work as my primary, wish I knew why, since being 3 times the size & it being another problem I'd love to figure out & use. Thanks for telling me about Dell but isn't there another way or place to regain all the original that came with this 400 when it was originally sold? Appreciate it, Thx.