You'd have to change it back, possibly. It depends on what your TV supports.
To be honest, I can't really think straight at this time of morning, but if your PS3 is on that at the moment and you're getting an error, I think maybe it's the wrong setting.
Look, just plug the PS3 into your TV and mess around with the settings that Spation posted about, then plug the PS3 back to your monitor and check if it works.Rinse and repeat.
What is your PS3 name?
So recently I wanted to play PS3 but I cant because my dad is watching TV and we only have one good TV in our house which is an 42" LG 1080P LCD TV. And I play PS3 on there whenever I can but my dad likes to watch TV as well and so he brought up the fact of hooking up my PS3 to my PC screen which is an 22" HP w2207 monitor. So then I went and found some conversion stuff for the pc that I got from graphics cards and I had one from HDMI to DVI and I use an HDMI cord when I run my PS3. So I fired it up and plugged it in to my monitor and it said "out of range adjust to 1680 x 1050 - 60HZ". And so I tried it on my dads 22" monitor to see if it said the same thing and it did. Then I went in to the PS3 settings and tried to change anything but no success does anyone have and suggestions or have had the same problem but got it to work if so please share.