2010 Mac Mini display and network issues after Mountain Lion installation

I just installed Mountain Lion on my 2010 Mac Mini, but now the display won't work and it isn't showing up on my network.  I have it hooked up to my TV (I don't have another screen for it) via HDMI.  Also, I've mainly used this computer by using the share screen function with my laptop, so I don't have a keyboard or mouse for it either.  The Mini is no longer showing up on my laptop's network list...  Any suggestions?

I would see if you borrow a USB keyboard and mouse
from some one, because otherwise trouble shooting the
problem will be next to impossible as sometimes the fixes
and diagnostics require the keyboard (PRAM reset, Hardware
Test, etc.).

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