There's something wrong with my ps3, can you please help me?

Ok so I had it plugged into my HD TV with an HDMI cable. My mum moved the ps3 and the HDMI cable broke, the wires pulled out and stuff. I thought oh well bad luck no more HD I’ll just go back to the red/white/yellow cable BUT I put it in and that didn’t work either! I tried a different tv too but it still didn’t work. As in everything was plugged in properly and turned on and the TV was turned to AV as usual but nothing came up on the screen. I mean the settings were set up for HD, the resolution and everything, as was automatically set when I first plugged in the HDMI cable. I guess I need to change the settings to go back to red/white/yellow but it doesn’t really help if I can’t see it in the first place, should it do it automatically like it did for the HDMI? Is it something I’m doing or do I need to take it in to get looked at?