What does this mean??

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!

If you combine two cells into one, what action are you performing? a.  adding a new row or column      b.  splitting the cells      c.  removing a new row or column      d.  merging the cells

List at least one thing to check for when you're checking the clarity and professionalism of a document.