Example scenario · illustrative, not a real seller
An example monitor shows a bright desktop through one cable, but a second input remains untested and the stand is missing its fasteners. The image alone does not establish the complete setup.
What you’ll get
- Check panel condition separately from input operation.
- Describe included stands, fasteners and power equipment.
- Measure the protected shipment rather than just diagonal size.
- A full-screen color panel check and what each defect is commonly called.
- A one-axis packing check you can edit, with the panel-protection precautions that follow.
Three things make a monitor sale: the panel, the inputs and the stand
Used monitors look simple. You plug one in, see a desktop and assume it works. But a monitor buyer is paying for three things at once. The first is a panel without problems that only appear on certain colors. The second is inputs that work with the computer they actually own. The third is a stand or mount that lets them use it on a desk. Miss any one of the three and the "working monitor" you sold arrives as a problem.
Monitors are also bulky, fragile and awkward to ship, so the packing plan matters as much as the test.
Step 1: Start with the exact model and the complete setup
Read the model number from the label on the back, not from the box. Write down:
- Model and any revision or variant code.
- The correct power equipment: an internal supply with a detachable cable, or an external adapter with its own rating.
- Stand parts: neck, base, screws or quick-release, and whether it adjusts for height or tilt.
- Mounting pattern if the back has VESA-style mounting holes, and whether the screws are included.
- Included cables and any remote or software media.
Do not assume parts from another monitor fit because they look similar. If the stand's fasteners are missing, that is a contents gap, not a footnote.
Stop sign: Do not power on a monitor with a cracked casing near the power input, a damaged cord or adapter, a burning smell or a bulging back panel. Do not open the casing. A repair project and a working offer are different products.
Step 2: Run a panel check with plain, full-screen colors
Display full-screen solid colors one at a time: white, black, red, green, blue and a mid-gray. You can do this with a simple image file or a full-screen color page on your test computer. Look for:
| What you see | Common name | Where it shows up best |
|---|---|---|
| A single dot that stays one color | Stuck or dead pixel | Black, white and each primary |
| Bright patches near edges | Backlight bleed or unevenness | Black screen in a dim room |
| A faint leftover image | Image retention | Mid-gray |
| Lines or bands | Panel or connection fault | Every color; note it and stop the "working" claim |
| Color tint across one area | Uniformity issue | White and gray |
Photograph what you see honestly. Phone cameras exaggerate or hide some of these, so describe the observation in words as well. Do not claim a calibration or a color accuracy figure you have not measured with suitable equipment.
Step 3: Test each input separately
List every input on the back of the monitor: HDMI, DisplayPort, USB-C, DVI, VGA, or whatever it has. Connect each one you can, with a known-good cable and source, and confirm that the monitor displays an image and selects the input correctly. Then record:
- Each input: working, failed or not assessed.
- Built-in speakers, headphone jack and USB hub ports, if present.
- Buttons and on-screen menu.
- Highest resolution and refresh rate you actually saw, with the source you used.
One successful cable connection is not a complete function record. If you could not test USB-C because you have no compatible source, write that.
Worked example: a one-axis packing check is only one axis
Monitors are where packing optimism goes to die. Suppose the casing is a chosen 24 inches wide, and you plan 2 inches of protection at each end. That requires 28 inches of interior on that axis. A box with 27 inches of usable interior is one inch short.
| Axis | Item | Padding (chosen, both ends) | Required | Box interior | Result |
|---|---|---|---|---|---|
| Width | 24 in | 2 + 2 in | 28 in | 27 in | 1 in short |
Those numbers are not a recommended padding thickness or proof of adequate protection. The other two axes, support for the screen, box strength and the complete configuration still need checking. The screen's diagonal size cannot replace any of those measurements. Try your own one-axis numbers in the scratchpad below, then use the full packing fit tool for all three dimensions.
Step 4: Pack so the panel never carries weight
The panel is the fragile part. Practical precautions include removing the stand where it detaches easily (and packing it separately inside the box), covering the screen with a soft, non-abrasive layer, keeping anything from pressing on the panel's face and stopping the monitor from moving inside the box. The original box with its inserts is often the best container if you have it; say so in the listing.
USPS's package preparation guidance covers choosing a sturdy box, cushioning and sealing. Weigh and measure the finished parcel before you quote shipping, because bulky monitors are where dimension-based pricing surprises sellers.
Step 5: Price the setup you can support
Compare against sold listings for the same model with the same stand and condition. A monitor with no stand, a monitor with a stuck pixel and a monitor with everything included are three different comparison sets. Local pickup can be worth offering for large screens; the packed-box guide explains why the shipped price should be set after the box is real.
Common mistakes:
- Testing one input and writing "all ports work."
- Shipping the stand attached and loose in the box.
- Quoting shipping from the screen's diagonal size.
- Forgetting the power adapter.
A monitor offer consists of image, inputs and physical configuration. Price the setup you can actually support and send, not the best-equipped version in a catalog.
Worked example · hypothetical, not a real seller
Keep the example in view
| Chosen input test log | Result |
|---|---|
| Input one | Image observed |
| Input two | Not assessed |
| Stand assembly | Fasteners missing |
| Full configuration claim | Not supported |
Chosen example · edit the numbers
Try your chosen one-axis dimensions; this is not a protection certification.
Illustrative inputs, not market benchmarks or an achieved outcome. Scratchpad values stay in tab memory, not saved by this application. Reload to reset.
Before the next transaction
With JavaScript and browser storage, only checked-step IDs can stay on this device. No buyer details or amounts are saved.
Practical questions
Does one working input prove every port works?
No. Record the actual tested input and conditions. An unassessed input remains unassessed.
Is the screen diagonal the shipping-box size?
No. Stand, casing, protection and the whole packing configuration determine the parcel dimensions.
How do I check a monitor for dead or stuck pixels?
Display full-screen solid colors one at a time, including white, black, red, green and blue, and look for single dots that stay one color. Describe what you see in words as well as photographs.
Should the stand stay attached for shipping?
Where it detaches easily, a common precaution is to remove it and pack it separately inside the box so nothing presses on the panel.
Do this next · one concrete move