I just switched my entire Minecraft folder to a new laptop and it opens fine on some of the profiles but the profile that I have most of my mods on (1.7.2 profile) won't open at all when I click "play" when the launcher comes up. I push play and it closes as if the game were about to come up but then nothing happens at all.
Apparently Java 8 doesn't work "very well" if it can't run older versions of Forge. All of my Saves are useless then since most of the mods I was using were only available for 1.7.2.
And the TooManyItems mod I am using for 1.7.5 does use SOME type of Forge.
And the TooManyItems mod I am using for 1.7.5 does use SOME type of Forge.