motor issues

Hi, I've recently received a Typhoon H from a friend, who hasn't used it in some time. After charging the batteries and ST16, and some light troubleshooting, I managed to get it ready to fly. However, when hitting the start/stop button, all the props start moving back and forth, and stop...

Bought the 4k in January and have logged in about 20 hours of flight time. Note.. never crashed it into anything. In late may had an issue that only 3 motors would start up. Went to Yuneec web site and a link said to go to Best Buy "Geek Squad" . The Geek squad sent it to their service center...