Since getting my PS2 for last christmas it has run excellently since then apart from the occasional disc read error (which was simply fixed with a DVD cleaner). However now when the disc tray opens (since about the 16th last month) it makes a kind of grinding nooise like its trying hard to get out but comes out fully. Whhat is this - is it nothing to worry about or has something slipped inside it(I have never opened or tampered with the console in any way apart from giving it a dust and hoover now and then). Please help this is starting to get annoying and I think my warranty is out anyways.