Yes, F8 works, I get to the menu, I can run ALL of the tests, without any problem.
On pressing F8 I usually select 'Repair your computer' or whatever it says, and I get to the screen which allows me to System Restor or run Start Up repair and everything else.
On running Start Up repair it tells me that no problem has been found.
When I run System Restore it restarts when finished and the exact same problem re-occurs - black screen, no Windows.
I put in the CD and absolutely nothing happened, as expected. The laptop is still making all the sounds it makes when it's being used, the fan works, the dvd drive opens, there's just no picture at all, nothing is happening.
I really can't explain this any better, it just isn't doing anything, and I really really really do not want to restore to factory settings like Dell recommends.