Blank screen, only works on HD tv with hd cable.

Go to your video settings or check your function keys to ensure that external monitor is enabled.

Since this is an older first generation (1999) HD TV it may not be compatible with newer HDTV receivers because the standards back then were different - Make sure the HD cable box is plugged into the HD component inputs on the back of the TV (not the DVD inputs) and that the menu setting on the TV is set to DTV (not RGB) video. This TV will only accept 480i and 480p signals on the DVD input. Also the HDTV input will only accept 480i,480p and 1080i (it will not work with a 720p signal,make sure your cable box is not set to that mode)

hdguru.com/setting-up-your-new-hdtv/35/

If you can first connect the Fios box via component and that will rectify the issue and still allow HD. HDMI is funny, if there is anykind of communication issues between the TV or the Fios box you see what happens. You might also call Samsung to see if there is ANY firmware/software updated for your TV specifically to fix such an issue with the Fios/Mortorola connection. If there isn't then the issue is the cable box since the TV works ok on HDMI with other devices.

Shelley,  the fix for this is simple! Hold down the power button for about 5 seconds and the system will beep. This resets the video setting for your ps3 from HD too whatever the current cables are that you are using too hook up too the tv. This works on my PS3 which I just bought about 3 months ago and should work with the older ones. 

Here is a link to reset your video settings to regular tv cables http://playstation.custhelp.com/cgi-bin/playstation.cfg/php/enduser/std_adp.php?p_faqid=1039&p_created=1210101461&p_sid=TgDtz9uj&p_accessibility=0&p_redirect=&p_lva=&p_sp=cF9zcmNoPTEmcF9zb3J0X2J5PSZwX2dyaWRzb3J0PSZwX3Jvd19jbnQ9MzEsMzEmcF9wcm9kcz00JnBfY2F0cz0mcF9wdj0xLjQmcF9jdj0mcF9zZWFyY2hfdHlwZT1hbnN3ZXJzLnNlYXJjaF9ubCZwX3BhZ2U9MSZwX3NlYXJjaF90ZXh0PW5vIHBpY3R1cmU*&p_li=&p_topview=1

u need a hd receiver to get hd on this tv. satellite or cable box. the screen blank in and out on hd signal. get use to the blackout.

If you are using component cables to connect your HD box to TV. Make sure your connections are tight. You should make the colors match up. Green, Red, Blue. Check on both TV and HD box. Make sure HD pox is powered on. Make sure to select TV input to Component 1 or whichever you are using. If this doesn't work you may need to call and have COX refresh the HD box. This can be done over the phone. This will make sure you are receiving and sending the proper signal level. Good luck

if you have a cable box then it is probably the resolution settings in the cable box, what type of cable box do you have

Might be a resolution issue, the menus are most likely in 480, while the video might be in a resolution not supported by your tv. Try changing the resolution and see what happens.