Sometimes a FlexClock will display a glowing blank screen and will not respond to key presses to get the prompts back on the clock.
One way to try to resolve this is to unplug then plug back in the power cord.
On the VeriFone Vx510 - Vx570 models try to press F2+F4 repeatedly until you get the system menu, but before any programs run (i.e. VeriFone screen goes away) or before the timekeeping application starts.
If the system menu freezes on you at any point in the menus before our app starts, then the clock is bad.
But if at this point the menu DOES operate properly, try doing a clear memory. (If the terminal has the new firmware on it, then the option is MEMORY FUNCTIONS, then CLEAR MEM, then CLEAR ALL GROUPS. On the older firmware, instead of being called MEMORY FUNCTIONS, the options are called RAM FILES and FLASH files, and both should be cleared.
Then reprogram the clock:
FlexClock - Firmware and Software USB Upgrade
OR
FlexClock - Vx Series - Firmware and Software Analog Phone Line Upgrade).
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