Gets stuck displayong BD-ROM and won't play

Sony have just released version 5.2, i had the same problem and i downloaded the firmware, it was a big upgrade as the facia kept changing a lot, but once done it played all my discs and was able to read them quicker.

Your Blu-Ray player needs a firmware update from Sony. Here is a link to the page to download the firmware http://esupport.sony.com/US/perl/swu-download.pl?mdl=BDPS300&upd_id=4704&os_id=27

You will need to download the firmware and burn the files to a cd-rom disc. First you double click on the downloaded file to extract the files to a folder. Then you will need to use the "burn image" setting in your cd burning software on your computer and burn those files to a cd-r disc. Then when you insert the disc into the Blu-Ray player it will start the update process. DO NOT DISTURB the player when the upgrade is happening and it usually takes about 30 minutes. Periodic upgrades will be needed with the player to be compatible with the new format of Blu-Ray discs. The full instructions are on the web page.