On laptops you might need to press Ctrl+fn+F1CtrlFnF1 to open terminal, what iI do is type "reboot now"reboot now to restart from terminal, to.
To go back to the GUI from terminal on my laptop (HP G56) iI have to Ctrl+fn+F8 CtrlFnF8 (apparently it could also be Ctril+fn+F7CtrlFnF7) and you should be back to graphical interface. Also
Also check http://community.linuxmint.com/tutorial/view/244
Stopping & Starting
shutdown -h now – Shutdown the system now and do not reboot halt – Stop all processes - same as above shutdown -r 5 – Shutdown the system in 5 minutes and reboot shutdown -r now – Shutdown the system now and reboot reboot – Stop all processes and then reboot - same as above startx – Start the X system
shutdown -h now– Shutdown the system now and do not reboothalt– Stop all processes - same as aboveshutdown -r 5– Shutdown the system in 5 minutes and rebootshutdown -r now– Shutdown the system now and rebootreboot– Stop all processes and then reboot - same as abovestartx– Start the X system