Not sure where this post should go so sorry if its not suppose to be here.
Here’s the stack trace:
SEVERE: Could not create displaySystem
com.jme.system.JmeException: Cannot create window: Pixel format not accelerated
at com.jme.system.lwjgl.LWJGLDisplaySystem.initDisplay(LWJGLDisplaySystem.java:444)
at com.jme.system.lwjgl.LWJGLDisplaySystem.createWindow(LWJGLDisplaySystem.java:143)
at com.jme.app.BaseSimpleGame.initSystem(BaseSimpleGame.java:381)
at com.jme.app.BaseGame.start(BaseGame.java:70)
at Sandbox.SandBoxMain.main(SandBoxMain.java:38)
any ideas? your help is much appreciated 
Do a forum search, this is a common issue.