Quad 2-input NAND-gate Not seems to work
This is what the internal circuit looks like on the 74HC03 (from the datasheet). 



To drive an LED, you need to do something like this: (left hand schematic, where gate and MOSFET are inside the chip). The right hand schematic shows a pullup resistor (again the gate and MOSFET are inside the chip). 







simulate this circuit &ndash; Schematic created using CircuitLab