Thanks for your reply.
From the plate on the back of the unit, it was made in Mexico, Dec 2003 SN=8771500 RA-6A.
Here is a more detailed description of what happened:
When it went bad a few days ago, after turning the power on, it will have about 2 or 3 seconds of sound but no picture with the standby light flashing -- I was not counting so I didn't know how many flashes.
Now after I did the power chord unplug sequence, there is no sound anymore. Instead it does the following sequence:
1. Cut on the power. there is a clicking sound (relay?) and the standby LED flashes 7 times at about 1 flash per second.
2. At the end of 7 flashes, there is again a clicking sound, same as the one before. Without any intervening dark period, the flashes continues at a faster pace, about half second per flash for a total of 8 flashes, followed by a dark peroid of 3 seconds.
3. After the 3 second dark peroid, it starts to flash at 2 flashes per second for a total of 8 flashes, followed by a 3-second dark period. This sequence would repeat itself endlessly without any clicking sound.
4. Press the power button at this time will not turn the power off but will stop those sequences in 3 and start doing 1 again. It seems that only two quick presses of the power button will turn the unit off.
Looking forward to hearing from you again,