Could be as simple as the switches not making proper contact. Turn the machine off and try a small squirt of WD40 onto the switch, then keep pressing the switch to free it up. Turn the machine back on and give it a try - you might be lucky.
Welcome to Pinballchat! I will be posting here regularly about pinball machines, with information about pinball machines I own, personal reviews of pinball machines, pinball machine repair tips, pinball machine game play tips, how to care for your pinball machine and any other pinball machine related subjects that take my fancy! If you have any pinball related questions please email the PinStig at pinballchat@hotmail.co.uk and I will do my best to answer your questions on this blog.
