Please help,urgent...my optimus cant detect sdcard and usb connection

[Guest ChZ9]

please help me,after i do app2sd,my phone restart,i tought the app2sd was sucess,but after that my phone cant read the sdcard,i've tried to replace the sdcard with other sdcard,but it still cant detect the sdcard...

and then i think maybe if i flash it,it will recover,but when i connect my phone to my pc,it only charges but my phone cant detect the usb connection...

i've tried to hard reset it,but its still the same...

can somebody tell me what to do?

thanks and sorry if my english is bad