computer restart automatically

At a guess without knowing more I would tend to think that you have a Power Issue. Depending on how the working USB Port is connected to the M'Board this may be the case. A USB Port directly soldered to the M'Board should work but a USB Port on a Fly Lead doesn't work is a sign of the inability of the system to supply enough power to run the device.

The shutting down when a File Transfer is attempted may be a sign of a critical low Voltage inside the computer causing the system to shut down when the extra load is applied. But if this is the case I would also expect other problems as well.

Also check any Fans inside the unit for function if one or more has failed it could be pulling the Power Rail down to a critical level. If the CPU Fan has failed it may be a two pronged issue where the Fan is pulling the Power Rail down and the CPU's temp is causing a shut down under load.

Col