WILL NOT PLAY SOME BLU RAY DISCS

You need to go to the LG website to get your firmware updates.

Blu-ray disc technology continues to improve and advance, so simply having a Blu-ray player in your computer doesn't guarantee that all discs will play immediately.
The Hewlett Packard DV7 Entertainment Notebook has a Blu-ray player, but as the technology advances you have to keep the software and firmware on the system up-to-date to ensure compatibility.

Reboot your Pavilion notebook.
A minor miscommunication between the disc drive and Windows Vista or 7 may lead to a disc read error.
Rebooting clears your system's memory and forces Windows to reload all of your device drivers, which may resolve a minor kink.
Play your Blu-ray disc to see if the problem is solved.
Open QuickPlay and update it.
Double-click the "Update" button to open "Updates and Enhancements."
Double-click "Get the latest QuickPlay updates."
Select "Download now!" on the next screen and wait while the file downloads and installs.
Close and reopen QuickPlay and insert the Blu-ray disc again.

Update MediaStart regularly.
This program tracks updates for your Blu-ray player's firmware, the software coded onto the device to tell it what kinds of discs it can read.
Open MediaStart and select "Update your MediaStart."
Updates are only listed when available, so if you don't see an update, check back in a few weeks.
Each update for the Blu-ray player enables you to play more recent discs, since some interactive features may not be compatible with older software.
Restart after each update.
Update your software on a disc-by-disc basis.
According to HP, some Blu-ray discs have special content protection and require new codes for you to play the movie.
These codes or disc-specific updates are stored on the disc.
If you are prompted to download a free update after inserting a disc, follow the prompts to do so. The updates will be different for each disc.
Check to make sure your player will play regular content if you continue to have issues with Blu-ray discs. It may be that the error is related to the drive, not the type of media.
Try a CD-ROM or a standard DVD to see if the disc responds.
If not, contact HP for a replacement or for drive-related troubleshooting.

HP blueray problems
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&taskId=110&prodSeriesId=3744231&prodTypeId=321957&prodSeriesId=3744231&objectID=c01361837

If you have one movie that it wont play, check to make sure the software/firmware is up to date. There are sometimes updates that fix issues like that.

LG BD560 BD Blu-ray Player wont play most of my photo files from discs or my external hard drive

It may need BD Profile 2.0 Some players will not play discs if this is not present. All new BD discs are BD Profile 2.0

call 1-800-243-0000 and they will send you an upgrade

Download the firmware file and how to document here:
http://us.lgservice.com/index_b2c.jsp

Follow document to create a disk, and update the firmware.

Latest version is v071101a. you can find it here and burn to disc.
Or contact LG for a disc.
As a work around you might try to switch between PCM and bitstream and see if that helps.

http://www.blu-ray.com/firmware/firmware.php?id=17

Since the LG combo platform doesnt suppourt many HD features if you are thinking about buying new Blu-ray player (since the format war is over) I would go with the PS3 - best value for the price, is already set up for adavnaced features such as internet connectivity (with auto software updates), even if you dont use the game features.

Blu-Ray will never play HD-DVD's, and HD-DVD's will never play Blu-Ray - they are competing technologies. Sorry.