My iphone won't get pass apple white logo?

I jailbroke my iphone and downloaded the winter board app. Then I tried to download a theme but it froze. The apple logo will flash on and on at some points

You might have downloaded a package that it doesn't like. If you have successfully installed Winterboard, you should have Mobile Substrate and Substrate Safe Mode as well. Try turning it off, then turning it back on like this:

When it's off, press and hold the power button and volume UP button. When the apple logo comes up, let go of the power button and keep holding the volume up button.

Your phone should boot into safe mode. You can let go of the volume up button when your lockscreen comes up (if it does). Then, you can go into Cydia and try deleting some problem packages

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