Who answers technology related questions in person, on the phone, or via email?

Experimental data that is expressed using numbers is said to be

Ihave a singular monitor that is a tv for my computer. recently, i took apart my computer and put it back together. when i put in the hdmi cord and booted the computer to see if it worked, the computer turned on fine but the screen was blue with "hdmi no signal." i've tried everything that doesn't require buying spare parts, any answer is appreciated!

How do you know if the website is secure if you make a purchase