Interactive screen not working? Fix picture, sound and touch problems

Start with the simple checks

Confirm that the screen is fully powered on rather than left in standby. Wake the laptop and make sure it has not entered sleep mode. If the screen has a freeze button, press it once in case the display has been frozen on an earlier image.

Open the input menu and select the exact HDMI, USB-C or DisplayPort socket being used. If the cable is plugged into HDMI 2 while the screen is showing HDMI 1, changing Windows settings will not solve the problem.

• Check power at the wall and the screen power switch.
• Wake or restart the laptop.
• Reseat both ends of every cable.
• Select the correct numbered input.
• Try a cable that is known to work.

No picture from the laptop

Press the Windows key and P, then choose Duplicate. If Windows does not show another display, open Settings, System and Display, then use Detect where available.

Try another HDMI input and another cable. Prowise recommends keeping its HDMI connection as short as possible and no longer than three metres for the best connection quality. Long leads, wall plates and unpowered adapters can introduce faults that are difficult to see.

For USB-C, confirm that both the laptop port and cable support video. A USB-C charging cable can power a device while carrying no picture. If the laptop works through HDMI but not USB-C, the screen is probably not the first component to suspect.

Picture works but there is no sound

Select the speaker icon in Windows and choose the Prowise, Optoma or HDMI display as the output device. Check the laptop volume, the application volume and the screen volume separately.

Disconnect Bluetooth headphones or a dock that may still be selected as the sound output. Restart the application after changing the audio device if it does not move automatically.

VGA does not carry sound, so older VGA installations need a separate audio cable. HDMI and compatible USB-C connections normally carry sound. If another laptop produces sound through the same cable and input, review the first laptop's audio driver and settings.

Picture works but touch does not

Touch control usually travels through USB, not HDMI. Make sure a USB touch cable connects the screen's labelled Touch port to the laptop. Do not confuse this with the ordinary USB sockets used for memory sticks and peripherals.

On Optoma panels with several video and touch inputs, use the touch socket associated with the selected HDMI input. The product manual shows the correct pairing. Move the cable to another laptop USB port and allow Windows a moment to detect the touch device.

If USB-C is being used, replace the cable with one known to support video and data. Restart both devices after changing the connection. If touch is inaccurate rather than completely absent, check the manufacturer's calibration or touch settings for that model.

Wireless casting cannot find the screen

For Prowise Reflect, AirPlay and Chromecast, the screen and casting device normally need to be on the same network and the same VLAN. Prowise notes that Miracast can use a direct wireless connection on supported configurations.

Guest wireless networks commonly isolate devices from one another. That improves security but prevents many discovery based casting systems from working. Ask the network administrator which wireless network should be used rather than moving the screen onto an unrestricted network.

On Optoma screens, confirm that Display Share or CreativeCast is running and that the displayed connection code or device name matches the one entered on the laptop. Product names and supported casting methods vary between generations.

When not to factory reset the screen

A factory reset can remove network details, application settings, management enrolment and room specific configuration. It rarely repairs a damaged cable or an incorrectly selected input.

Before resetting anything, record the screen model, serial number, software version, network connection and any management platform in use. Schools should check with their IT provider because the screen may be centrally managed or subject to filtering and safeguarding requirements.

Information to collect before requesting support

• The screen make, model and serial number.
• The laptop make and model.
• Which input and cables are being used.
• Whether picture, sound and touch work independently.
• Whether a second laptop works on the same connection.
• Any message shown on the screen or laptop.
• Whether the problem affects one room or several rooms.

How Bury I.T. Support can help

Bury I.T. Support Ltd can test the screen, cabling, laptop, wireless network and touch connection as one complete system. We can also standardise classroom connections and provide simple room guides for staff.