Maybe you are using a dodgy ti-84 hex or bm2. I went through probably about 3 different ones until I got a good 8xk and bm2 that worked well together. If you still got that black screen problem, try the ones I am using on my ti-84 plus silver...Sponsored Links
its a bit large size zip, cause I had prepacked the 2 files along with the latest comgenie file manager all in a package. hopefully they will work fine for you too.