T540 XP. 2021 no fuel or spark

[Conner]

I have been asked to look at a T540. It won’t start. I’m lead to believe it was running ok. One day and wouldn’t work the next. Checked stop switch looks ok. Plug is dry after many pulls so suspect no fuel. Also tried to see a spark with plug grounded no spark I can see. Not too familiar with the auto tune saws a bit new for me but want to learn. Where would you suggest starting. 
Hope this repair doesn’t take as long as the last one🤣

[adw]

Let’s start with is it a mark 1 or mark 11? stating the obvious if there is no spark it’s never going to run, so start by removing the ignition switch and diss connecting the wires, check again for a spark, no spark and you may be replacing the coil, I will not kid you it’s a near strip down to do this.