Default [Q] NOTE 2 n7100 4.3 jellybean not detecting in download mode by computer .

NOTE 2 N7100 4.3 jellybean not detecting in download mode by computer .

Tried to change port not worked
tried on another computer not worked
tried re-installing samsung usb driver of different version but not worked.

My Note 2 is working and detecting when is powered ON,

but when it is in download mode it's not detected by any computer .

Don't know what is the problem.

Pls Help........