Just because, sometimes minecraft won't give you a error report, instead it goes black.

 

It gives you a error report if you start it using console and all though.

 

 

Its some sort of really long command line...

Might want to have worded that better but i understand what you meant. Use this to launch MC to get error logs in CMD

https://dl.dropbox.com/u/70622753/minecrafterrortest.bat

You could run it with MultiMC, and that gives you a nice console window.

Or just look in the ForgeModLoader-?.log file.

me is starting mc with following batch file. it allows me to run different minecraft versions in different folders:

 

set APPDATA=%~dp0
java -XX:+UseConcMarkSweepGC -XX:+DisableExplicitGC -XX:+UseAdaptiveGCBoundary -XX:MaxGCPauseMillis=500 -XX:-UseGCOverheadLimit -XX:SurvivorRatio=12 -Xnoclassgc -XX:UseSSE=3 -Xincgc -cp %~dp0minecraft.exe -Xmx1024M -Xms512M net.minecraft.LauncherFrame

 

at line 1: set Appdata means, for the running bat the windows environment variable for the APPDATA Folder is changed.

Usually Appdata is set to something like C:\users\username\appdata\roaming

Don't be confused about %~dp0 , this means Current folder. If you clicked the batch file with Path C:\harr\batchfiles\mcblah.cmd , %~dp0 has value C:\harr\batchfiles\ (watch it, there is a trailing \)

So you don´t have to care about paths for your different minecraft folders. You can copy the folder without checking path in the batch file.

 

at line 2:

hm...don´t ask me...copied and pasted some crap out of google and workmates mails and mixed it with my own

 

its possible to start only with:

java -jar C:\path\to\mc\minecraft.exe -Xmx1024M -Xms512M net.minecraft.LauncherFrame

 

The benefit starting with batch file is an additional DOS Window, where you can see console messages.