Needle will not move up or down
The bobbin winder shaft could possibly have been left in winding position - Move bobbin winder shaft back fully to left or back to sewing mode.
The clutch in the hand wheel may have been left out of gear after bobbin winding - check clutch and if necessary re-tighten.
The buttonhole lever was not lowered when machine was placed in buttonhole mode - Lower buttonhole lever.
Presser foot maybe in up position, a lot of modern machines will not work untill presser foot is lowered - check and lower foot.
Other Answers in the Category "Sewing Machine Troubleshooting Guide"
11. Fabric puckers