Just picked up a 13" Air 45min ago. Wife and I got a SWEET deal on it from best buy. It was an open box special. It lists for $1299. This one was marked down to $990 PLUS we got a $100 BB gift card as well. No time to mess around with it b/c I have homework to do. Is there anything I should check for when first using it to make sure it's 100% good?