Which laptop can play minecraft and is under 4.7lbs under $400?

With your $400 budget, you should just look for one. Check the requirements, and make sure that PC will work for you. Mine is $270, and it runs it just fine. HP Pro book 6455b

http://m.bestbuy.com/...oduct+view this should run ok you may need to lower setting and you will not be able to play serious mod packs very well

That's a pretty hard set of needs. If you lower your expectations to 4.9lbs, you can get this: http://m.bestbuy.com/...9198750553

http://www.newegg.com/...26gqowmc10

this would be a good computer to try