If the attached doesn't work try this...
Just to the right of the 4 program chips (the ones with the labels on them) are the two large RAM chips.
Carefully pry each RAM chip out of it's socket using a small flat blade screwdriver.
Slide it between the chip and it's socket (!! not the PC board and the socket !!) and rock the screwdriver back and forth as you slide further down the chip.
Your goal is to ensure that none of the RAM chip legs get bent so they drop back into the socket.
Swap the top and bottom RAM chips, plug them back in (line up the pins with the socket holes and press in gently) , make sure the notch on the chip is still facing away from you (same notch orientation as the program chips) then try clearing the board again.
If that doesn't work you need to see if the RAM chips are getting the voltage from the battery.
If the RAM chip's notch is facing away from you place your voltmeter black lead on the lower left pin of the RAM chip and the red test lead on the top right pin of the RAM chip.
You should read at least 3.4 VDC, a fresh battery will read (across it's leads) about 3.76 VDC. There is a diode in series with the battery before the voltage gets to the RAM chips and it drops about .3 VDC so don't freak if the battery voltage doesn't read the same as the RAM voltage.
If none of the above works then you need to send the board to our shop. Call Larry at 702-363-9998 M-F 11AM to 5PM PST and make arrangements.