Epwc, I've got
a program called POWEROFF.EXE that will reboot a server remotely, as long as you've got an administrator password for the remote server. You don't need poweroff.exe to be installed on the server in order for it to work.
The only thing is... it's software. And as such, it doesn't have the ability to actually cycle the power. All it can do is essentially the same thing as selecting Start Menu-> Shut Down-> Restart.
What this means: If there's something going wrong with the server in question... For example, if there is a program that's locked up on the server, and that lockup is preventing the system from shutting down gracefully, then it'll do what any Windows box does when you select Shut Down from the Start Menu: What'll happen is all the OTHER programs on the server will shut down and the computer will fail to restart.
So if you don't have anyone to actually go down there and push the button as a last resort, you might not want to experiment with poweroff.exe.
Edit: I just noticed the part where you said you couldn't ping the server. Of course no software solution will work if you can't ping the server. Sorry.
Still, for the future, poweroff.exe is a very useful little program to have in your tool kit.