I have an HP dvd 840x internal. I have burned roughly 150 dvds on it to date. Now, it will not burn dvds, it will not recognize blank dvd media of any kind, it will not read previously burned dvds or store bought dvds. It has no problem reading blank cd media, but takes FOREVER to read a cd rom. I'm going nuts here, and am extremely pissed after having just dumped 0+ on a complete overhaul on this computer. HELP!!!!!!