Yes mate I'm certain it's socket A as it's one of the old Athlons and the sempron is just a rebrand as far as I'm aware.

I'll pop over with it tonight if you want to give it a go, but you'll need to pm me your addy again as I can't remember it and I know I'll get lost again

You're at the point now where you're running out of options to test I hate when it gets to that. As I say, I'm not sure if the processor is still ok but I'm 99% sure it is.