my computer is only using 3gb of RAM,  but there is 6gb installed. it says only 3gb is usable. why might this be and how can i fix it?

motherboard- Gigabyte technology x58a-udr3
DD3 memory.
i have intel cpu i7 920 @2.67 for a chip

Does the Western Digital Ultrastar 14TB DC HC530 7200 RPM SATA 6.0Gb/s 3.5" Data Center Internal Hard Drive - 0F31284 come with a 5-year warranty or a 2 year warranty? On the website it says Up to 2.5M hours MTBF with a 5-year limited warranty but under the warranty and returns Limited Warranty period parts and labor 2 years.

Western Digital Ultrastar 14TB DC HC530 7200 RPM SATA 6.0Gb/s 3.5" Data Center Internal Hard Drive - 0F31284

Not quite sure what the difference between mean

I'm developing a Bootstrap project and started out with a UI kit theme but found that tweaking it was an issue, so I'm now using standard-issue Bootstrap.  My question is what or where are recommended/best form UI Components?  I've researched, but am not sure which are quality ones, so recommendations or a guide to resources is appreciated.   I usually use Foundation, and this project is also new to me as it is financial and has dates, amounts, percentages and charts.

I'm using the current Bootstrap version as it is today at https://getbootstrap.com/.

  <!-- Bootstrap CSS -->
  <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/css/bootstrap.min.css" integrity="sha384-GJzZqFGwb1QTTN6wy59ffF1BuGJpLSa9DkKMp0DgiMDm4iYMj70gZWKYbI706tWS" crossorigin="anonymous">

  <!-- jQuery first, then Popper.js, then Bootstrap JS -->
  <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>

  <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.6/umd/popper.min.js" integrity="sha384-wHAiFfRlMFy6i5SRaxvfOCifBUQy1xHdJ/yoi7FRNXMRBu5WHdZYu1hA6ZOblgut" crossorigin="anonymous"></script>
 
  <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js" integrity="sha384-B0UglyR+jN6CkvvICOB2joaf5I4l3gm9GU6Hc1og6Ls7i6U/mkkaduKaBhlAXv9k" crossorigin="anonymous"></script>


UI components of …

Is there an easy way to determine if all systems in our ORG have TPM chip?  A way to verify it's being used or rdy for use?  Without touching each individual machine?

This is a real doozie! Dell T7500 workstation. Began with both front fans ramping up slowly from normal slow speed to full on. The computer seemed to operate normally. POST said the fan was defective. I replaced every fan in the unit except or the one in the power supply. No change. I replaced the video card with an unused Nvidia Quadra 4000. No change. I unplugged the hard drive. No change. At this point I am a bit desperate. I spoke to a technician that said the motherboard was the trouble. I then replaced the MB with a tested used one. Again...same problem. The ONLY components left is the power supply and the ram memory. So, I had an unused DEll identical part number PS available. After install? You guessed it. Same problem. Then the last thing I tried was a tested cpu that had identical numbers and specs. Again, a waste of time and money. ONLY the ram is left. I tested it using the long test and it shows as OK. Where do I turn at this point?

Has anyone tried installing these USB dongles to an older laptops that don't have Bluetooth built-in?  

Trying to install on my parents older Sony Windows 7 laptop.  It doesn't seem to be activated?  Is it a faulty doungle?  

Does any Expert know of an organization that supplies surplus / used computers to the elderly? I know of a person on a fixed low income that cannot come close to afford to purchase a computer. She lives in Oklahoma and is in a small town and is somewhat isolated. A computer would make a great difference in this person's life. I had seen many years ago a story detailing a young man in his teens that collected anything and everything and reassembled components for this exact purpose. If anyone knows of such a program please let me know so that I can turn this person's information over to them for consideration. This person is an education magnet! She reads every book she can get her hands on and would feel like she were in heaven if she had the ability to be on the internet. At the moment she has been loaned a small 8 inch palm type device but due to the size and the slow speed it is virtually useless. I personally would pay it forward to her some sort of book club subscription if she was able to obtain the computer. It IS the season for love and giving. Any thoughts or ideas would be appreciated.

looking for laptop with intel i7 with widnows 10 and 1 TB disc space and 8-16 GB memory configuration around 500$
how and where i can set alerts to get emails on it to purchase
please advise

Does a PCI Express graphics card's power draw depend on the type of slot it is put in?

Example Scenario:  A PCIe graphics card that is designed for a PCI Express 3 slot is placed in a PCI Express 2 or 1 slot.  It is thus unable to produce the maximum output it has been designed for, if it was in a PCI Express 3 slot.  In this situation does it require less power to produce it's output seeing as it is restricted in where it is?

Added to question:  Power coming from PCI Express slot only.

I'm having the lot of XSD, which is included with single XSD file and all the files are getting valid well and the corresponding XML file also getting valid against corresponding XSD using oxygen XML editor. But while uploading the xml file against the XSD's file in the product. I'm getting the below error:

    Error resolving component 'Definition.attrib'. It was detected that 'Definition.attrib' has no namespace, but components with no target namespace are not referenceable from schema document

When I opened the corresponding file, it shows validated in oxygen XML editor. Here is the code for the corresponding file:

<?xml version="1.0" encoding="UTF-8"?>

<xs:schema 
  xmlns:xs="http://www.w3.org/2001/XMLSchema"
  xmlns="http://www.w3.org/1998/Math/MathML"
  targetNamespace="http://www.w3.org/1998/Math/MathML"
  elementFormDefault="qualified"
 >

<xs:include schemaLocation="common-attrib.xsd"></xs:include>
<xs:include schemaLocation="../common/common-attribs.xsd"></xs:include>

<xs:attributeGroup name="mean.attlist">
  <xs:attributeGroup ref="Definition.attrib"/>
  <xs:attributeGroup ref="Common.attrib"/>
</xs:attributeGroup>


<xs:complexType name="mean.type">
  <xs:attributeGroup ref="mean.attlist"/>
</xs:complexType>

<xs:element name="mean" type="mean.type"/>

<xs:attributeGroup name="sdev.attlist">
  <xs:attributeGroup ref="Definition.attrib"/>
  <xs:attributeGroup ref="Common.attrib"/>
</xs:attributeGroup>

<xs:complexType name="sdev.type">
  

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