One thing you may want to do is flash the firmware to make sure it is not corrupted. You can download the software from the site or you can download T2 software and use it to upgrade the firmware. See if that fixes it first before moving on to hardware issues.
@CompWhisperer One last thing to try. Unplug the USB and remove the Nano clone from the controller board and put in on something insulating, plug it in and see if it works. If there's a short on the board it would prevent it powering up, this would confirm if the "Nano" is bad or the actual controller.
Jpegs and bmps will burn as they look. As in solids will be burnt solid. If you use Inkscape and import ur image and "trace bmp" - save as SVG the image will be outlined when loaded in Elekscam/picCarve.
@asos8627 If you can connect to the COM port but don't get a Grbl Ready message then your Nano is corrupt. If you are unable to load Grbl firmware then you'll need to re-flash the bootloader. If you don't know what that means, Google it or just buy a replacement Nano for a few dollars.