@Will-i-am,
Sorry to hear about your friend, I kinda know what you`re going through (Gran passed away a couple of weeks back).
One thing I`ve learnt, the more you think about them, the easier it gets. I know it sounds wierd, but it helped me a lot, especially thinking about the stupid/little things from over the years, it just brings a smile to my face and makes me glad I was part of her life.
Anyway, about that A4000..there`s no such thing as a stupid question, so don`t be afraid to ask.
It`s often something infuriatingly simple, such as when Xray`s A4000 became unstable, it turned out the plastic spacers under the CPU card were the wrong length for that card !