After I purchased the computer I found a sticker on the side panel saying that if the seal is broken then it cancels any warranty.  The sticker is on the seam of the panel.  So if I want to simply add more Ram or add another video or sound card etc., it would require that I BREAK the seal to open the side panel door.  Then the warranty is broken.  I sent a message to the seller through Amazon twice and NO response. I went to return the item and found there is a 20% restocking fee.Be careful.