Could be the PS4 is outputting at a resolution not supported by your TV.
Try the steps at http://ps4.wonderhowto.com/how-to/ps4-wont-connect-your-tv-try-these-no-signal-troubleshooting-tips-0149511/
Could be the PS4 is outputting at a resolution not supported by your TV.
Try the steps at http://ps4.wonderhowto.com/how-to/ps4-wont-connect-your-tv-try-these-no-signal-troubleshooting-tips-0149511/