What is wrong with my c902?

[letkoo]

yes i did sir... but it does not work :( mass storage does not even work.. :( as if it does nothing when i plugged the cable :(

[satch1234]

yes i did sir... but it does not work :( mass storage does not even work.. :( as if it does nothing when i plugged the cable :(

Try this as a last chance:
1.Shut down the phone and remove battery for 5-10 seconds
2.insert battery back into phone but don't touch power button,phone must be off.
3.press and hold 2 and 5 buttons and don't let go.
4.Insert usb cable into the phone(don't let go 2+5 buttons) and try to move it slowly up and down,if you will see that phone is detected then hold usb cable in that position.
Try few times but always reinsert battery before try.
If can't be detected then probably usb connector is broken or some other hardware problem so you will have to take it to some private repair shop.