How to set an img tag with an id to false if the source is empty?

I am trying to set the visibility of an img tag with the id of #myComputer to false if the inner html doesn't have an image source assigned.

HTML

    <img id="myComputer" src="assets/myComputer.png">

JS

    var myComputer = document.getElementById('myComputer').src;
    var myComputerVisible = true;

    if(myComputer == ""){
    myComputerVisible = false;
    };

When I remove the source and check the console 'myComputerVisible' still shows as "true" even if I remove the source in the html:

    <img id="myComputer" src="">

Plain Javascript only. Please advise! Thank you!