should I buy this pc?

[Rebox99]

Hello so I got a tight budget and seen a pc selling for a good price and I'm not really educated In reading specs so I'm asking you guys to help me and see if I should buy this pc for $400

And if I do buy it how can I tell if it's good or not ?
Should I have him test it infront of me? Anything I should look for thanks!
link
Screenshot

 

[starsync]

Does it come with a motherboard too?