Cowcrafting

Title: Crash Version: 3.1.2 OS: Windows 7 Java Version: update 21 Description of Problem: When I try to join a server or a SP world first appears the background dirt and then a white screen.I have reinstalled java.I have reinstalled tekkit.I have updated .net Framework.But I can't solve the problem.I didn't have it before.Just tried to start and it happened.And I'm not cracked. Error Messages: none Error Log: none

When I launch tekkit classic everything's okay.But when I try to join a singleplayer world or multiplayer first the background dirt shows and then a white screen.I have deleted my tekkit and reinstall it.I have reinstalled java.I have allocated more RAM to tekkit.I have downloaded many .net Framework trying to fix it.There is no crash log.Just a white screen.Please someone respond so I can play with my friend.And I'm not cracked!