All 4x on on System Startup, then its :-
Down to 3x = CPU Detected.
Down to 2x = DRAM Detected.
Down to 1x = VGA Detected.
All out = System Boot-up.
Note if the last LED does not go off (indicating a VGA error) its wrong, it means you have your Ram in the wrong slots which is nothing to do with VGA, got me that ******* one, thought me card was shagged when i had a DFi board.