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                <h1>Made your PC:</h1>

  <label>Processeor: </label><select id="processor" name="processor">
  <option class="label" value>Select Processor</option>
  <!-- Home Ware -->
  <option value="P1">Processor 1</option>
  <option value="P2">Processor 2</option>
  <option value="P3">Processor 3</option>
  <option value="P4">Processor 4</option>


<p><strong>Only compatible components will show.</strong></p>
  <label>Select motherboard: </label><select id="motherboard" name="motherboard" class="subcat" disabled="disabled">
  <option class="label" value>Select Motherboard</option>
  <!-- Home Ware -->
  <option rel="P1 P2" value="AS1">ASUS RAMPAGE V EXTREME</option>
  <option rel="P2 P3" value="AS2">ASUS ATX DDR3 2600 LGA</option>
  <option rel="P1 P3 P4" value="GB1">Gigabyte AM3+</option>
  <option rel="P2 P4" value="MSI1">MSI ATX DDR3 2600 LGA 1150</option>

  <label>Select RAM: </label> <select disabled="disabled" class="subcat" id="RAM" name="RAM">
  <option class="label" value>RAM Memory</option>
  <option rel="AS1 AS2 GB1" value="KI1">Kingston Value RAM</option>
  <option rel="AS1 AS2 MSI1" value="P5KPL">P5KPL-AM SE</option>
  <option rel="MSI1 GB1" value="960GM">960GM-VGS3 FX </option>

  <label>Select Video Board: </label> <select disabled="disabled" class="subcat" id="video-card" name="video-card">
  <option class="label" value>Video Card</option>
  <option rel="MSI1 AS2" value="EVGA8400">EVGA GeForce 8400 GS</option>
  <option rel="AS1" value="XFXAMD">XFX AMD Radeon HD 5450</option>
  <option rel="MSI1 GB1" value="GTX750Ti">EVGA GeForce GTX 750Ti SC</option>
<button id="btn">Click me</button>




$("#btn").hide().on("click", function () {
	var choices = [];
  var hasEmpty = false;
  $("select").each(function() {    
  if (hasEmpty) {
    return alert("Select all components")
  alert("You selected: " + choices.join(', '));

$('#video-card').on('change', function () { $("#btn").show() });


  var $supcat = $("#processor"),
      $cat = $("#motherboard"),
      $subcat = $(".subcat");

    var _rel = $(this).val();
    if(!_rel) return $cat.prop("disabled",true);

    var _rel = $(this).val();
    if(!_rel) return $subcat.prop("disabled",true);
Promise you'll await for me.