My name is Deepa. You can refer to this link for any kind of troubleshooting help and drivers installation:-http://www8.hp.com/us/en/support-drivers.html
You can also try to connect an external monitor to isolate the issue and check if it is working fine with that or not. Please do a BIOS update as well and then video drivers need to be updated. As far as my knowledge, humidity is not a concern, but even though I would suggest you to clean the screen with a clean dry cloth.
For further help please reply.
Thanks and Regards *moderator edit: removed shortened link and replaced it with full link - Queen-Evie*
Edited by Orange Blossom, 04 August 2012 - 07:50 PM.
Removed spammy content. ~ OB