Thanks for posting your system specs.
Hmm, intel integrated graphics, are cruddy for playing games.
However its weird that you can play one game then it goes black.
I suspect its it intel integrated graphics card you have (it's just a guess)
Here's somethings to try i you haven't already:
A. Reinstall- this will solve 80% of all problems
B. Take a look over at the nexon tech forums and send a support ticket
http://forum.nexon.net/CombatArms/forums/8624/ShowForum.aspx
This thread seems to suggest Intel graphics aren't working for a lot of people.
http://forum.nexon.net/CombatArms/forums/thread/1571923.aspx
"This is most likely because your video card does not support all graphical features needed to run Combat Arms. This is a common issue with integrated graphics processors. Unfortunately, the only fix is to get a stand alone video card that meets the following requirements"
Quote from the official CA website
http://combatarms.nexon.net/Support/FAQs.aspx
one last question, have you been able to play the game fine in the past ?