the guy told me he purchased it like 6 months ago. When I got home and checked the serial number, it looks to be out of warranty. I then emailed the guy and asked him when he purchased it. He said he would look for the receipt and get back to me the next day. Well that was a couple of days ago and nothing. I have plugged it in and it seems to look okay. I'm not sure what to look for or how to look for it, in order to discover if this thing is truly in good shape, or about to die. Any tips on how to deal with this or how to make sure the display is in good shape?