We're hooking up our PS3 to a new television....and it keeps telling us there is no signal...what could be the problem?

The drivers on those particular ports have been loaded yet. From desktop hit "start" then right click on computer then click on "manage". Nest click on "device Manager" when it opens up look for ports with yellow question marks and right click on them and trouble shoot them. Or,, you may have to go down o the bottom of the page and open up some new ports and drivers.
Col. Dana Gillespie

is that the av channel? if so, how do you know your getting a signal from the ps3? try hooking the ps3 up to something else to make sure you have a signal coming out of that cable (this is where you have to start) if you have another device like a DVD player, or VCR, hook that up to the AV input (or channel one as you say). if you get a picture from those devices, the problem is your ps3 not sending the signals to the tv. sorry I can't be more helpful, but that's my guess

this could be a PS3 software issue, if you can let it auto update, if the problem isnt resolved try a 720i setting or a 1080p, if still no joy your display may be on the way out

The first step for this issue is to try a hard reset. Hook up the PS3 with both the Analog cable and the HDMI, set the TV to the Composite (analog) Input that you have chosen. Then, while the PS3 is off (red light), press and hold your finger on the power button for approx. 10-15 seconds until it beeps again. This will reset the PS3. After it turns back on, go through the set up steps, and after, it may tell you it has detected an HDMI connection, say yes and switch the TV to the HDMI input you hooked it up to. Click on yes before the timer ends and you should be all good.

Either the ps3 isn't delivering the signal on all AV exits (in that case it's defective - get a new one) or the cable is faulty - use another one.

Try to decrise output signal resolution from PS3 to 720P,

since your tv is almost new it should be under warranty. call the place where you bought it and tell them you need to have your warranty honored.

Are you sure the tv is 1080p capable? Usually when "mode is not supported" is displayed, it means that the tv can not handle the signal format that is being input to it. If you are using HDMI, then signal formatting is usually handled automatically. If you are using component video, you will probably have to tell the PS3 to step down the signal to either 1080i or 720p.

Are you on the correct video source on the TV

If your TV has a USB port or a media card input, then I would contact Proton for a possible software upgrade as this is most likely the issue.