Can anyone help me identify this component? It just says 0 or D on it (I think it's a zero). I tested it for conductivity with a multimeter - doesn't seem to have any (tried both polarities in case it's a diode). Tested for resistance: nothing (i.e. infinite resistance), although I'm not 100% sure I was touching the contact points correctly, so don't take this as an ultimate measurement. Thanks in advance!
This is a 0 Ohm resistor. Probably in 0805 package.
If the multimeter shows infinity (open circuit), or any significant resistance > 0, when measuring the element's resistance it means that it is damaged. The multimeter should show zero resistance when measuring such "resistor".
On the PCB you can replace it with a solder blob or a piece of wire.
Be careful using a solder blob or too heavy a gauge of wire you might blow other components in the circuit. An analogy: Your car has blown a 5A fuse and your radio stops working, well you check and you don't have any 5A fuses on hand. So.... you substitute a 10A fuse instead, you could cause damage to the radio or whatever shares that circuit because too much current flowing through the 10A fuse. Better check to see if deices in that circuit could have caused to infinity reading in the 0 ohm resistor.