Received the Lenovo thinkcenter and the machine would not boot right out of the box. Tried several different cables and peripherals with no luck. Power indicator would light up green and then the machine would beep twice and become unresponsive. No windows boot screen just black. Multiple searches for the issue listed defective ram as the issue. I noted the issue and was still charged a restocking fee. So, moral of the story is $30 later I still don't have a PC. These are refurb machines and you're taking a chance of receiving a PC that doesn't work. Buyer beware.