Media Device (MTP) problem I have USB Debugging on, whenever i set the USB Computer connection to MTP it just disappear in the Devices list, I set to PTP and it appears in the Devices list, help please.
Its an incomplete question but will try to answer.
First of all make sure you installed your smartphones drivers successfully by enabling usb storage if available.
If its not available install from your smartphone manufacturer website or from xda developer website.

Then try to reboot your laptop and reconnect your smartphone with your laptop.

It will surely fix the issue.