issues with ps3 and new HD tv..

[HomeGrown]

well ok.. i got a Emerson PL-P42W-10A black friday special from wal-mart.. and i cannot get my ps3 to read the tv.. i've did everything i could.. tried to change it manually and everything i did the reset av settings thing and all (where u turn off your ps3 and then push and hold it on/off button till it beeps 1 time indicating that it has changed the av settings then a 2nd beep turning the system off) i cannot get anything to work.. i've been up for 2 hours trying to get it to work.. and i'm giving up very pissed off.. (btw this is a 42'' Plasma compared to my 27'' cable tv..) HELP ME IF YOU CAN!!

I should say i had it on HDMI before then house got struck by lightning then had to go back to the 3 prongs (red,white,yellow) and im trying to go back to HDMI