Almamet

Greetings ladies and gentlemen, I've got an issue with modpacks, and I hope i didn't post this in a wrong board, I'm still new here. Let's get to the point! So a week ago, I downloaded Technic Launcher, and I downloaded The Crafting Dead modpack. Everything runs fine, no problems at all. Then I downloaded Test Pack Please Ignore modpack. The download progress is fnished, but everytime I press PLAY button, nothing show up. The game doesn't launch. The same thing happens with Tekkit. So I searched the internet, and someone has the same problem! They said, uninstall Java 8, and use Java 7. I did it, and nothing change. I hope someone able to help me, thanks in advance.