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I have the exact same issue with My 2003 Boxster S, and have actually posted this about a month ago.
Since then i have had had the fulse box open, cleaned the fuses that relate to the dashboard illumination. On the same circuit (which i think is A or B5) is the rear numberplate light, so next time it happens check if this comes on. If the rear numberplate light doesn't come on (check to make sure the bulb works first though) then its all connected and not going to be a problem with your instrument cluster.
I'm not sure if i just had a loose connection as when i banged the fuse box area and moved the wired going into the rear of this the dashoboard lights sometimes came on. Above the fuse box are also relays and i made sure that these we all seated properly. i think i may of had a dry connection somewhere and moving the wires has made the circuit work again.
Although i havent tested the car on the road due to the snow in the UK, everytime I try them in the garage they have worked first time.
Hopefully you may have some luck and find this works to.
All the best
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