Hdmi problem no detecting video on hdmi.everything else is good.cables resolution 1280*720.it was working

Steps

1. Step 1 Check for an HDMI port Check the back of your television for an HDMI port and refer to your owner's manual for your television's resolution. A resolution of 1080p offers the highest quality.
   
2. Most PS3 systems support 1.3 HDMI, but older systems may need a software update from the 1.1 or 1.2 version.
   
3. Step 2 Disconnect cables Disconnect all the cables and adapters from the back of your PS3, and then unplug your TV to reduce the risk of shock as you work.
   
4. Step 3 Connect HDMI cable Connect the HDMI cable. Reconnect the power cables on both the TV and the PS3 system.
   
5. Step 4 Hold power button Hold down the power button until the PS3 beeps and continue holding it for an additional five seconds until the system makes a second beep.
   
6. The Playstation 3 should detect the high definition cable and automatically adjust the settings to give you the best picture and sound possible.
   
7. Step 5 Test the connection Test the connection. If the HDMI cable isn't working, turn everything off and reconnect the original cables to manually change the settings.
   
8. Step 6 Adjust the settings Turn the system back on, select Settings, Display Settings, Video Output Settings, and then HDMI. Repeat the process for your Audio Settings. You can now experience your games with the highest video and audio quality available.
   

Use any HDMI cable to to this.

Connect cable to the "HDMI" port on the back of the PS3. Connect the other side of the HDMI cable to the "HDMI" port on the Toshiba TV. If the Toshiba TV has multiple HDMI ports, make note of which port you plugged the HDMI cable into.
Change the Toshiba TV to its "HDMI" video display mode. Press the "Power" button on the PS3 to turn the console on. The PS3 will automatically detect the HDMI cable. Select "Yes" to use the audio and video from the HDMI cable. Select "Yes" to have the PS3 automatically use the optimal settings for the Toshiba TV. Select "Yes" to accept the recommended resolution. Press the "X" button to save the settings

Check out this Youtube video - it explains exactly how to do this. It's got great information and very complete. Since you've already got an HDMI cable, you don't need to buy anything else.

Good luck!

1. Make sure the HDMI cable is connected to the HDMI OUT port on the back of the PLAYSTATION 3 system. Connect the other end of the HDMI cable into the HDMI Input port of the TV or display monitor.
   
2. While the PLAYSTATION 3 system is in standby mode (red light on the front of the system), hold down the touch-sensitive power button on the front of the system until the system goes into standby mode again . (So the light cycle would go from: red light --> green light --> then back to red light). This will ensure that you have held down the power button long enough to reset the Video Output Settings.
   
3. Turn on the PLAYSTATION 3 system and once the system finishes powering up, the Video Output Settings will automatically reset to the standard resolution (or detect the current display output settings of your TV/monitor).

Your PS3 video resolution is set too high for the monitor to display, try starting at lower resolution first and go up from there.
Google PS3 resolution setting.

http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
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http://en.wikipedia.org/wiki/Capacitor_plague

The Vizio GV47LF HDTV's connection bay has everything we'd expect. It includes a pair of HDMI inputs which can take 1080p sources (at 60 but not 24Hz), two component-video inputs, one A/V input with composite video and one with composite and S-Video, one RF input for cable for antenna connections, an optical digital audio output, and a VGA-style PC input for PC connections.
If you're connecting a computer, you'll probably be disappointed that the VGA input maxes out at 1,360x768 resolution (which did look pretty good) instead of the full 1,920x1,080. We did connect a PC via HDMI and got 1,920x1,080 resolution, but the image didn't look as sharp as the 1,360x768 version. Again, we believe this has to do with the lack of a dot-by-dot mode, although perhaps people playing with picture settings, either in the Vizio or in the video card's drivers, can achieve a better-looking higher-resolution computer image. All-in-all, shoppers looking for a big computer monitor would be better served by the Westinghouse LVM-47w1.


HDMI CABLE

Try using RGB cables and unplug the HDMI cable from the PS3, then while the PS3 is off, hold down the power button/sensor on the PS3 untill you hear a beep or a few beeps. This will force the PS3 to automatically detect the TV/cable resolution settings. Hope this works.

I would first try changing the inputs if there is an HDMI cable connected the PS3 will detect it and change the output to HDMI. Make sure when you connect any HDMI cables that the power is off on ALL Units that are using HDMI. Connect the cables then power up all units. Change TV and Receiver or Amp to correct HDMI Inputs. On the PS3 go to Display Settings over to the left of the Crossbar. Select output settings and select HDMI and everything after select AUTOMATIC! Then Set your Audio (Also use Auto) and Save by pressing X.  Good Luck!

Well it might be becuase your ps3 is european. Im no expert on the matter, but when i bought an hdmi cable and hooked it up to my hd compatible tv, i switched to the hd input (which happened to be input4 on my tv) and a message popped up saying that the ps3 has detected hd output, would you like to change settings? and it did it automatically after i hit yes.

Check your setup in HDPVR lower resolution to 720P or 1080I or check HDMI cable adaptor or set your Hitachi on auto detection video in MENU
Good luck