Your Corporate Colocation Dedicated Server utilizes an IPMI which gives you virtual access to your server where you can reboot your server.
Using the assigned IP address for your IPMI port along with your assigned username and password and it will be just like you are at the server with a keyboard, mouse and monitor.
To restart your server when it has been hung up by the OS, you would log in to the IPMI and select "Power Control' and then select either "Reset Server" or "Power Cycle Server"
If your IPMI is non-accessible our support staff will reboot your server at no charge. if your IPMI is accessible by you but you still wish to have our staff reboot your server there will be a $25 service charge.