Doing some additional reading, the Apex Comprehensive Reference Manual provides some troubleshooting procedures when your lights don't work, pages 73-74. Even gives some instructions using a multimeter. This will help you narrow down the issue by confirming serviceability of various components. Should give a better idea if it's something in your power bar or if you should suspect a ballast issue. Good luck, hope this helps.
https://www.neptunesystems.com/downl...nce_Manual.pdf
EDIT: Sorry, the procedure on page 73-74 is for dimmable light ballast, may not be appropriate to your issue, but the tests should still tell you if the relays/triacs on the power bar are functional. I need to read more carefully, or completely before I post stuff!