Late 2011 11" MacBook Air, OS X 10.7.5, 24" Cinema Display. System has been operating normally. Tonight could not start computer. Disconnected all cables, started while holding down Option key. Started normally. Connected peripherals, including Cinema Display; computer went to blank/blue screen, no picture on Cinema display. Unplugged mini display port, computer returned to normal. We had some lightning today, All power to computer and display routed through UPS Power Backup/surge protection. Any thoughts?