I have a Denon DVD 2900 that has persistently given me problems. Will play CD's/DVD's one minute and not the next. Sometimes completely new discs are not accepted, sometimes old ones, sometimes they do work if i try them again. It makes quite a loud spinning up noise that is not apparent when it does read, it then displays all 0's for the time on the CD. I've heard there are firmware upgrades, will this solve my problem? I had it 'chipped' to be multi-region - could this be the problem? Any advice would be gratefully recieved.