bought a tv off ebay, Samsung SM933HD. first one i got sent worked for about 5mins then the screen would go black. ahhh. sent it back and got the replacement today. however. this one dosnt work either! when you turn it on the screen goes completly white and nothing happens. no stactic, no sound, nothing. menue button dosnt do anything. so anoying. have contacked the seller again, just waiting for a reply. dont think its him messing about, as he has 100% feedback and has been helpfull with emails and stuff. its just really anoying! anyone else had similar problems with TVs?