bad day! now fone wont start

Hmm,

May I suggest a Factory Reset. It will clear all Apps and Settings done on the phone.

To initiate it turn off the phone, Remove the battery to make sure. (Then Reinsert it).

Now Press and HOLD The Volume Up + Home Key (the Middle button on the bottom of the Phone) + Power Button.

As soon as you see the device light up let go of the Power Button but keep the Home Key and Volume button Pressed.

Release all buttons when you see a Menu with the title Recovery. (Or something like that I forget the wordings).

From Here Scroll Down with the Volume Key to Factory Data Reset (It will be closely worded to that, not Cache it will be Wipe Factory or Data Reset), select it with the home key.

Then the next menu will have an option of a couple of No's and one Yes scroll to the Yes with the volume Key and Select it with the Home Key.

You phone will pause for a couple of seconds and reboot.

It will appear to be stuck on the Galaxy S screen don't worry it can take upto 10 Mins.

Once it boots in it will ask you to enter a few details as the device will be fresh, like Country and your Gmail account.

Peace.
IronSingh