Have you tried turning the camera on with the memory card removed? If not, please do so and let me know the result.
Try a hard reset:
Remove the battery, memory card (if installed) and disconnect any usb cables. Press and hold the ON/OFF button for 5 seconds . Allow the camera to sit idle for 30 minutes. Press and hold the ON/OFF button for 5 seconds again. Reinstall the battery without the memory card and try to power on. If there is no response, plug in the USB cable and connect the camera to the computer and note any activity.
Please let me know the result.
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