Chris Jarrett

From: conrad wright


i dug out my 15c flight manual....if you ever have any problems with the calculator, press and hold [ON]....then press and hold [-]...release [ON]....then release [-]....the display will show [Pr Error]....press any key to clear the display. you have just put the calculator through a "cold reset" returning all states to default status. the [Pr Error] message indicates "power error" good luck.... conrad i have two 15c calculators and am authorized to use lethal force to protect and defend them.