Mac mini screen wont work after lion

My hdmi connection to my tv wont work after installing lion last night. It worked once last night but hasnt worked since. All cables are in tact and computer is set up the same. I cant even see anything to fix it!

I called apple - I'd have been in trouble if my mac had been my only internet access!
I had to reset the P-RAM
as so:
mac is powered off
turn on power then instantly press keys: command option P R
the mac will chime as usual then on the second chime let go of the keys.
After this my screen worked again.
For info - command key is cmd, option key is alt
I did this with an old mac wired keyboard - not sure if it will work on bluetooth keyboard, but it might.

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