My screen flickered and now all I get is black and white pixels - any ideas for a fix before I take to the Genius Bar?

MacBookPro is about 8 years old now so has had a good innings.  Last night the screen flickered, and then went off.  Turning Mac back on again brought black and white pixels - small rectangles all over the screen.  In background is little apple in middle of screen with the round rainbow timer thing vaguely visible.  This then sticks and I just have the pixels nothing else.
Any ideas?
I have booked with Genius bar tomorrow but am feeling bereft!
Thanks in advance.

It's certainly a hardware problem that only Apple techs would be able to properly diagnose. Keep your appointment...
Clinton

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