I understand that you took the memory card out and put it back in, but, have you tried powering the camera up from the off position with the card not in the camera? If not, please try it and let me know the result.
Try a "hard reset".
Remove the lens, memory card and battery, set the mode dial to M (manual), and switch the camera to the ON position. Allow the camera to sit idle for 30 minutes. Then, switch the camera to OFF, re install the battery and lens, switch it on and observe the display.
Please let me know the result.
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Did you put the memory card back in the camera?
What is on the display?