Email Mike Gifford at
[email protected] and explain your problem.
I have had an MX-500 original that came up RAM Empty once, but I left it for 30 minutes and replaced it with brand new AAA batteries.
I have not had one with a LIGHT Fail message (even when the backlight wasn't working! Go figure!).
Try taking the batteries out for 30 minutes, and see what happens. Otherwise, email Mike!
... Greg :-)