1) Is the mod compatible with 1.3_01, unless you are using 1.2, in which make sure they are also compatible with Beta 1.2.
2) Remember to remove the Meta-Inf folder (already done i presume since no black screen)
3) There are mods that work with ModLoader v4, but not v5. Check for that.
4) Make sure there are no conflicts by dragging all mods into a folder.
5) You may also need other mod managers like AudioLoader or More Block IDs or ToolUtils or 303's Spawnlist.