PS3 HDMI not working.

Recently acquired a PS3 fat and having some video issues. AV works but tv displays no input when using HDMI. I have attempted to reset the video by holding the power button, but I don't ever get the 2 beeps. I get one beep with power on then about 45 seconds later, 1 beep to power off. HDMI cable has been tested and works with other consoles. Attempted on multiple TV's as well with the same result. PS3 works just fine using AV cables. Tested playing with elder scrolls oblivion. Any ideas or tips?