You have multiple options to diagnose your raspberry pi from this page.
This will shutdown the Raspberry Pi
Reboot your Raspberry Pi
Will list all connected USB devices.
Will populate the kernel log
Will populate all network interfaces. (ifconfig)
Will test your upload and download broadband speed.
Will list all active running processes
You can interact with your Raspberry using the custom terminal window. You can type what ever you normally would from the shell window.