Something is wrong — start here

The useful thing to know first is which of the four problems you actually have. They look similar from the sofa and have nothing in common underneath: a flat picture is a player problem, ghosting is an alignment problem, silence is an enumeration problem, and a device that will not connect is usually a cable or a setting.

What you see	First thing to check	Work it out
No depth — one flat picture, or two halves squashed together	Whether the file carries two views, and whether the device is in side-by-side or mirror mode	Not 3D →
Doubled edges, ghosting, soft outline	Vertical offset or rotation between the two views — measurable in pixels	Ghosting →
No sound through the glasses	Whether the audio output even exists, then whether a tone plays through it	No sound →
A headset the computer cannot see	Whether an ADB interface is exposed at all	Not detected →

Every answer names the layer, not just the fix

Each verdict is tagged with what it blames — cable, settings, firmware, device, content or host — plus the one observation that would confirm it. That tag is what stops the usual loop: reinstalling drivers for a misaligned pair, or replacing a cable over a menu setting.

Why the device check comes before opinions

Most advice for these problems is a list of things to try, written by someone who cannot see your machine. That is why it reads like a checklist and why it rarely ends. This site takes the other route: read what the hardware reports, then act on the reading.

Three readings settle most cases, and none of them requires installing anything:

• The display mode inside the glasses. Side-by-side and mirroring look identical to the operating system — both present a wide panel — but only one of them can show depth. Reading it from the device is the only honest way to know.
• The host display arrangement. If two screens sit at the same coordinates the desktop is being duplicated, and a player drawing one stereo frame across it gives each eye both halves.
• The audio endpoint. A device can be perfectly paired and still have no audio output enumerated; "no sound" is often that, not a driver.

What is written so far

All four lines are worked through. Not 3D narrows to one of five causes; No sound separates a missing sound card from a muted one; Ghosting decides whether the pair, the mode or the link is at fault; Not detected separates the cable from a setting from the firmware.

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