After 6 months my computer won't stay on unless it's plugged into a wall and gets hot after a few minutes of being on. I took it to the apple store where I was informed that the battery and hard drive were both old and clearly had not been replaced in the unit when it was sold to me. I wrote to the seller but no response. Do not buy!Update- the seller responded to a second message and refused to refund me, despite intentionally selling me a faulty product.