i just JB-ed my iphone, everything was well until I wanted to install "categories" from Cydia.
Had to reboot the device. and after that, comes out the screen with the usb connection thing. Gone case !

Have to restore and re-JB my iphone 3GS again .. Headache !

Does that mean my phone cant use "categories" app?

iPhone Generation : 3gs
Current Firmware : 3.1.2
Current network: maxis unlocked set
iTunes Version : 9
PC/MAC : pc
Jailbreaking software : blackrain
Problem Encountered : after i downlaod "Categories" from Cydia. It asks me to reboot my device. AFter clicking on it. It shows the usb connection to itunes thing. And I can't turn on my iphone after that. SAD ! Afraid can't be restored. I just got my iphone few hours ago !!
Steps Taken So Far : Downloading firmware

Modertor's Note: DO NOT DOUBLE POST!!!

Moderator : I have already search through this thread and I cant find the paragraph u PASTED in my post. I have also read through the past 10 pages out of 96 pages to search for my answer. Does it hurt to post my problem here again ? Why are you being so rude ? zzz

thanks very much for d explanation.
Because I was confused when the usb connect screen turned up, and my friend say i have to restore it.
Will try it again using blackra1n to see if it works.