There is a switch under the playfield that registers the target is down. Each target has its own switch. If this switch is not working or a wire is broken off then the game won’t know the target is down. There are lots of things that could be wrong but the driver board is not one of them. Start with the simple stuff. Take the glass off and raise the playfield (with power off) and visually inspect the switch and wiring. If that all looks good then lower the playfield, power up and go into the diagnostics and bring up the switch test. Manually raise and lower the target and see if it registers.