Weird that you can ping the box and not see anything at boot.
I'd try to rule out a duplicate IP address (as stupid as it sounds, been 
there, done that...) 

I'd boot the box with a Debian Live CD, then
.- mount the box Debian partition to /mnt
.- mount --bind /dev /mnt/dev
.- chroot /mnt 

And begin typing 'apt-get update/apt-get upgrade' away as necessary.
YMMV...
ET 

 

Mark Phillips writes: 

> I used aptitude to upgrade a headless server from Debian stable to Debian
> testing. The upgrade did not generate any error messages, but when I
> rebooted I could not ssh into the box (connection refused) nor do I get any
> output on a monitor I attached to the box (no signal). Apache does not
> appear to be running either on the box (could not connect to the box). I
> can successfully ping the box. 
> 
> Any suggestions on how to fix this this server would be greatly appreciated! 
> 
> Thanks, 
> 
> Mark
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