Minecraft forge not opening?

I recently got minecraft forge to mess around with some mods (finally). Downloaded Minecraft Forge, installed client, and set the version for the launcher. When i clicked play the launch from the home page went away then re-appeared on the home page.
Clearly missing something, any help?

Hmm, you need to be more specific so I can help you with this problem. Please specify what version forge are you trying to install and what the crash report says. Although installing forge is very easy, often people make small mistakes which result in this type of a problem. Check if you have installed it correctly by following all steps given here . If you have done all the steps correctly then a problem can also arise by installing multiple mods together. Some mods clash and crash the game. I can help you better if you can be a bit more specific.

If this helped you, rate 5 stars:-)

Oh sorry, i'm using mineforge & minecraft 1.7.2 and using the correct download
I don't have any mods in it