Why are some buttons not working

Unplug it for 15 minutes to allow it to reset. If the problem persists please give us your model number and I'll look at it further.

I’ve replaced my control panel and touch pad and still have buttons that don’t respond the main one being the start button. Is there anything else that can control this?

It may not be necessary to replace the touchpad and the control panel. You can take a blow dryer move it back-and-forth over the pads that don’t work, and keep pressing the pad up and down. they may come unstuck. This has worked for mine on several occasions. What happens is when you’re cooking the grease Will cause them to stick over time. Give it a try before you throw everything away.