2004 g35 coupe wont start. Is it the starter?

Hi there.

Firstly, have you checked that the battery is connected and has a charge in it? (This can be determined by looking to see if the dash lights illuminate when you turn the ignition on).

It could also be your spark plugs/glo plugs need cleaned or changed.

Another thing it may be is if the immobiliser is switched on.

Check all of your fuses.

Failing all of this, then yes, it could be your starter.

Hope this helps.