1. I suggest wiggle the the AV Cable if you use RCA plugs"Yellow, Red, White" because sometimes it comes loss mine does.
2. Do you switching the PS3 from RCA to HDMI because the system does not auto switch back there is a way to reset the Video Config and this is it Hold down the power button until it beeps twice and then it should get video backup.
because like with me I have to use the RCA AV cord but when I take it to my buddy's HDMI picks up but when I come back home I have to reset the setting
More info about Video Config: http://manuals.playstation.net/docum...deooutput.html