HI guys, I've got problem with my arduino mega,if it's something familiar with you,I would really appreciate help 
I use arduino for my 3d printer,it's been working fine for 2 months, yesterday
The RepRap LCD became white and motors stopped working. When you bend screen little,you can barely read,also I can't put sd card,it says "in it fail" .When I give it "Auto Home" command,the motors don't move. I plugged usb cable and connected to my laptop and screen became normal again, but still no response on commands. We changed the shield(ramps 1.4) and nothing changed,so we think it's arduino. Do you have any idea what's the issue? thanks in advance
What is the voltage of the 3D printer's power supply? It sounds to me like that supply has gone bad. In normal operation it would supply the motors and the Arduino with the LCD powered from the Arduino. When you plug in USB the Arduino and hence the LCD is powered by the PC but the motors would still have insufficient power.
It's 12V but power supply is just working fine 
To me, this indicates, "initialization (power-on-self-test) failed" - the system did not complete the power-up.
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