I have a server running Windows 2012 Standard that becomes unresponsive regularly and requires a hard shutdown. It is a dell poweredge T420. It's our DHCP and has file shares. When it freezes, the shares are inaccessible, I cannot remote onto the machine, but can ping it. Remote desktop will not work. When physically at the machine, ctr-alt-dlt will work but the log on screen never shows. The article linked below also describes my issues however the machine is not an HP and does not contain the .sys file referenced.