Screen won't come back after installing updates

Hi,
Fell behind in installing updates, so I did them all in one go yesterday. Message came up to warn me that my screen was going to go dark and not to restart. This was near the end of my work say so I left it overnight. I've come in this morning and while the computer is 'working' (accessable across the network etc.) nothing is coming up on screen - it looks completely dead. I zapped the PRAM and still no joy.
Has anyone come across this before? And how do I get my display to wake up? Any suggestions welcome.
Thanks.

Only got it June this year - brand new.

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