Make sure you did not use WEU.
Make sure all jass triggers are correct.
Make sure it really has frozen and is just not insanly slow.
If none of these help, attach map to thread and I will try, to see if it just does not use up more recources than your computer has while loading (which some maps do).
If you have lots of 1000 level spells, or 1000s of object fields in the object editor, then the problem is it is just loading insanly slowly.
If you get an error message, please post it here.