After battery replacement, the screen contrast is liable to change: It may be too dark (your current case) or too light. You must adjust the contrast.
Keep pressing the relevant arrow key until the contrast is adequate.
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Try adjusting the contrast and see if that helps.
Turn calculator on.
Press and release the 2ND key.
Press and hold the down-arrow key to decrease the contrast.
Obviously, you'll use the up-key if you've decreased the contrast too far, after pressing and releasing the 2ND key again.
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