My 91 300zx 2 + 2 has an intermittent starting issue. The alternator and battery have been recently replaced and check out good. Here is the problem: Sometimes, when I turn the key in the ignition--nothing happens. All of the dash lights stay on. There is also no sound--no screechy starter noise. Sometimes she starts, sometimes she doesn't. It always starts eventually if I hold the key on the start position. I'm afraid my luck's not gonna hold out so I need some answers. Any advice would be appreciated.

 

Starter relay.

 

possibly ignition switch contacts if there is no relay clicking at all