We don't have a cat. We do have 2 dogs, though

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Alright, when I get home, I'll open it up and try pushing the components back in.
My brother's external hardrive was attached to backup data. I'll disconnect it.
I don't feel very good about updating the bios. The last time we had the computer repaired, I think the people at the shop may have installed the wrong motherboard.
When it still worked, occasionally it would just restart out of nowhere, but it said it was a driver error or conflict or something like that.
How old is really old? It's also possible it might be a virus. My father used the computer, and he admitted to doing something he didn't understand online.