There was a book I read when I was younger, probably around 2000 at a guess. Its main character was a woman who I seem to remember had a photographic memory but I can't remember how that tied into the plot.
The main storyline was about her working at this corporation where she would speak to her friendly computer and I seem to remember it was because she had a chip embedded in her brain. She would speak to her AI to get things done.
I can't remember much about what happened through most of the book but I think the twist was that the AI was evil and the baddy all along.
The front cover had a woman's head surrounded by metal tubes that may have been dipped in oil, so most of it was black. I thought it was called something like "Black Screen" but I've hunted far and wide and can't find it at all!
Anyone know the book?