Blue screen / Grey screen / 'Flashing Floppy'.
Problems with the power lead or AC adaptor.
Battery needs replacing.
Keyboard sticking / keys not working.
If you spot any of the following behaviour on your MacBook Air do call us:
The folder icon has a question mark on it and flashes.
Completely white screen.
Poor performance (tasks taking longer, the machine taking longer to respond to commands).
Seeing a coloured spinning circle (looks like a beachball).
Split drinks (hot or cold).
Dropping the MacBook, or knocking it on the floor.