I purchased a used '07 GT-27 with a 21i-TB control. The machine has been sitting for some time and i think the battery dead. I powered up the machine with the expectation of seeing a alarm but the screen remains black. I what it the proper power up sequence for the machine? i would have thought after putting a new battery in and cycling power that the startup screen would have appeared. Does anybody have any advice? Does anybody have a machine with a 21 control and a serial number near MG-466 who could help with the parameters. thank you very much.

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