>> DO I need to do a cold boot ? <<

Probably, esp if there is a chance you entered the initial password wrong...

however, it could also be a screen alignment issue, so, be sure what you
are entering is what's responding on the keypad.

Unless you have something sensitive on the device, suggest not using a
password until you are familiar with the device and have established a
good backup process.

Beverly Howard [MS MVP-Mobile Devices]