Minecraft Forums

I need help with a small problem. When I download more than three mods in minecraft, it will randomly shut down my computer at any random time. There aren't any conflicts in the mods, it happens with every group of four mods I download, even the modpacks which have mods that are completely compatible with each other. One time, all I had were TooManyItems, Optifine, The Lantern Mod and Custom NPCs. Does anyone know how to fix this (And yes, I have deleted and re-installed .minecraft, it doesn't work that way apparently)? It's really annoying when I'm trying to do something and my computer randomly shuts down