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I have recently acquired an Arduino and LCD display, I have been experimenting with it and I have made it work, and had it working for a few days on a few different sketches. This morning, I uploaded a new sketch to the unit and all of a sudden it comes up with a line of solid blocks on the top row on the LCD (Freetronics 16x2). This happens even if I upload a new blank sketch, it stays with the top row of solid blocks.

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    \$\begingroup\$ This question might be better suited to the new arduino.SE beta site. \$\endgroup\$ – Dave Tweed May 3 '14 at 1:01
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A top line of solid blocks appears when the display has not been initialized, or if it has become deinitialized after a brownout. Be sure that the code initializes the display properly and that the decoupling capacitor is functional.

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