Sorry if this seems obvious (I'm way newer than everyone else here, as can be seen in my profile ), but a good few of them aren't Forge compatible. I recently spent a good few hours trying to get them to work with ModLoader, and ultimately had to place about half directly into the jar. Also, when searching the minecraftforum post, I did find a list of those which are forge compatible, but it wasn't consistent with those that ultimately needed to go right into the jar. If you like, I could post my findings, but I'm not sure exactly how much they apply here considering I was only using ModLoader. Again, I'm new and very inexperienced when it comes to modding, so could you just say exactly which mods you installed?