Monitors FAQ: How to Choose, Connect, Test, and Buy a Used Monitor

What Is a Computer Monitor?

A computer monitor is the screen that displays your computer’s picture. Unlike an all-in-one computer such as an iMac, a typical desktop monitor does not contain the computer itself. It needs a separate PC, laptop, mini PC, workstation, or dock connected by a video cable.

Beginner explanation: monitor vs computer

A desktop PC can run even if no monitor is connected, but you will not be able to see what it is doing. The monitor does not usually store files, run Windows, or install apps. It only displays the video signal coming from the computer.

Monitor Size Explained

Monitor size is measured diagonally from one corner of the screen to the opposite corner. A 23-inch monitor does not mean the monitor is 23 inches wide; it means the visible screen area measures about 23 inches diagonally.

Common Monitor Sizes

• 19 to 22 inches: compact, affordable, good for small desks.
• 23 to 24 inches: the best all-around size for office, school, browsing, and general use.
• 27 inches: larger and more comfortable for multitasking, design work, spreadsheets, and split-screen use.
• 32 inches and larger: useful for specialized workflows, gaming, editing, or users who prefer a large display.

Deeper dive: why 23-inch and 24-inch business monitors are so common

Business-class 23-inch and 24-inch monitors are common because they balance desk space, price, readability, and productivity. They are large enough for documents, email, browser tabs, spreadsheets, and remote work tools, but small enough for standard office desks and dual-monitor setups.

Resolution: 1080p, 1440p, and 4K

Resolution describes how many pixels are on the screen. More pixels can mean sharper text and more workspace, but only if the monitor size, computer, cable, and user preferences all make sense together.

Full HD / 1080p

Full HD means 1920 × 1080. This is the standard resolution for many 22-inch, 23-inch, and 24-inch monitors. It is excellent for everyday use and is usually the best value in used monitors.

1440p / QHD

1440p, also called QHD, usually means 2560 × 1440. It gives more workspace than 1080p and is especially useful on 27-inch monitors.

4K / UHD

4K usually means 3840 × 2160. It is very sharp, but it may require scaling in Windows or macOS so text does not appear too small. It can also need better cables, newer graphics hardware, and more graphics performance.

Beginner explanation: what is a pixel?

A pixel is a tiny dot of light on the screen. A picture is made from many pixels. More pixels can make the image sharper, like a photo with more detail.

Panel Types: IPS, VA, and TN

The panel type affects color, contrast, viewing angle, and motion. For most refurbished monitor buyers, IPS is the easiest recommendation.

IPS

IPS monitors usually have better viewing angles and more consistent color. They are excellent for office work, school, browsing, general use, light photo editing, and multi-monitor setups.

VA

VA panels often have stronger contrast and deeper blacks, but they may have slower motion handling depending on the model.

TN

TN panels can be fast and inexpensive, but they usually have weaker viewing angles and color consistency than IPS.

Refresh Rate and Response Time

Refresh rate is measured in hertz, abbreviated as Hz. It tells you how many times per second the monitor refreshes the image.

Is 60Hz Enough?

Yes. For web browsing, office work, email, school, accounting, remote work, video calls, and general computer use, 60Hz is completely normal.

When Does Higher Refresh Rate Matter?

Higher refresh rates such as 120Hz, 144Hz, or above matter most for gaming and fast motion. They are less important for a basic home or office setup.

Deeper dive: refresh rate vs response time

Refresh rate describes how often the monitor updates the picture. Response time describes how quickly pixels change from one shade to another. Gamers often care about both. Office users usually do not need to prioritize either beyond choosing a reliable monitor with a stable image.

Monitor Ports and Cables

A monitor must have a compatible port for your computer. The most common monitor connections are HDMI, DisplayPort, DVI, and VGA.

HDMI

HDMI is common on desktops, laptops, TVs, and many newer monitors. It carries video and can also carry audio if the monitor supports speakers or audio output.

DisplayPort

DisplayPort is common on business desktops and professional monitors. Many Dell OptiPlex and HP business PCs use DisplayPort.

DVI

DVI is older but still useful. It carries digital video, but it does not usually carry audio.

VGA

VGA is an older analog connector. It can work for basic displays, but HDMI or DisplayPort is usually preferred when available.

Beginner explanation: ports and cables

A port is the socket on the computer or monitor. A cable connects the two sockets. The cable ends must match the ports, or you need an adapter.

Should You Buy a Used Monitor?

Used monitors can be one of the best values in computer hardware. Business-class monitors from Dell and HP are often built for long workdays, adjustable stands, standard ports, and reliable office use.

Benefits of Buying Used

• Lower cost than buying new.
• Good value for home offices, schools, small businesses, and spare setups.
• Often includes practical business features such as height adjustment, tilt, swivel, and VESA mounting.
• Keeps working hardware in use longer.

Things to Watch For

• Scratches or pressure marks on the screen.
• Dead pixels or bright stuck pixels.
• Loose stands or missing screws.
• Yellowing, scuffs, or cosmetic wear.
• Missing power or video cables.

For more used-computer buying guidance, see How Long Do Used Laptops and Desktop PCs Usually Last? and Why Repair Scores Matter More Than Specs in 2026.

Grade A vs Grade B Monitors

Used monitors are often sold by cosmetic grade. The exact meaning can vary by seller, but in general, Grade A is cleaner and Grade B has more visible wear.

Grade A

Grade A usually means the monitor is in very good used condition. It may have light signs of normal use, but it should look clean overall and be suitable for customers who care more about appearance.

Grade B

Grade B usually means the monitor works properly but has more cosmetic wear. This can be a great value if you want a reliable display and do not mind scuffs or blemishes.

How to Test a Used Monitor

Whether you are buying locally, setting up a refurbished monitor, or checking a monitor after shipping, test it carefully before relying on it.

Deeper dive: dead pixels vs stuck pixels

A dead pixel is usually dark and does not light up. A stuck pixel may stay red, green, blue, or white. One or two minor pixel issues may not affect everyday use, but clusters or central defects can be distracting.

How to Set Up a Monitor

Most monitor setup problems come from the wrong cable, wrong input selection, or incorrect display settings. Follow these steps first.

Step 1: Place the Monitor on a Stable Surface

Put the monitor on a flat desk with enough room for the stand. The top of the screen should usually be near eye level or slightly below.

Step 2: Connect Power

Plug the power cable into the monitor, then into a wall outlet or surge protector.

Step 3: Connect Video

Connect HDMI, DisplayPort, DVI, or VGA from the computer to the monitor. Use a direct cable when possible.

Step 4: Select the Correct Input

Use the monitor’s buttons or menu to select the input you connected. For example, if you used HDMI, choose HDMI.

Step 5: Adjust Display Settings

In Windows, right-click the desktop and choose display settings. Set the monitor to its recommended resolution and arrange multiple monitors if needed.

For help with Windows PC setup, see our Dell OptiPlex setup guide or the Rytech PNW Help & Support Center.

Dual Monitor Setups

A dual monitor setup can make work much easier. You can keep email or chat on one screen and your main task on the other.

What You Need for Dual Monitors

• A computer with two usable video outputs, or a compatible dock or adapter.
• Two monitors.
• The correct cables for each monitor.
• Enough desk space.

Deeper dive: matching monitors in a dual setup

Dual monitors feel best when both screens are the same size, resolution, and height. They do not have to match, but matching monitors make window movement, mouse tracking, and desk appearance more consistent.

Monitor Stands and VESA Mounting

Many business monitors support VESA mounting, which means they can attach to monitor arms, wall mounts, or specialty stands using standard screw holes on the back.

VESA mounting is useful if you want more desk space, a cleaner setup, or better height adjustment.

Refurbished Monitor Options at Rytech PNW

Rytech PNW offers a collection of genuine used and refurbished Dell and HP monitors at low online prices. Availability can change, but common refurbished monitor options include:

Browse current availability in the Rytech PNW catalog, or contact us through the Contact page if you need help matching a monitor to your PC.

Monitor FAQ

Is a used monitor worth buying?

Yes, especially for office, school, business, and general home use. A used Dell or HP business monitor can be a strong value if it has been tested and accurately graded.

Is 1080p still good?

Yes. 1080p is still a very practical resolution for 22-inch, 23-inch, and 24-inch monitors.

Is 60Hz enough?

Yes. 60Hz is enough for normal desktop use, browsing, documents, schoolwork, email, video calls, and most business tasks.

What is the best monitor size for most people?

Most people should start with a 23-inch or 24-inch monitor. It gives enough space for everyday work without overwhelming a standard desk.

Can I use a monitor with a laptop?

Yes. Most laptops can connect to an external monitor using HDMI, USB-C, DisplayPort, a docking station, or an adapter.

Can I connect two monitors to one PC?

Yes, if your PC has enough video outputs or supports a compatible dock or adapter. Business desktops often support dual displays.

What if my monitor says “No Signal”?

Check that the computer is turned on, the video cable is secure, and the monitor is set to the correct input. Try another cable or port if available.

Do monitors have batteries?

Standard desktop monitors do not have batteries. They must be plugged into power.

Do monitors include speakers?

Some monitors include speakers, but many business monitors do not. If audio matters, check the model details before buying.

What should I do if my monitor arrives damaged or incorrect?

Inspect your package as soon as it arrives and contact Rytech PNW right away. If something is damaged, defective, or incorrect, we will work quickly to resolve the issue.