Something goes wrong at most events. Not always with the AV. But when it is the AV, it tends to be visible and audible to every person in the room at the same moment.
A microphone that cuts out during a speech. A screen that goes black before the main presentation. Feedback that makes the front row flinch. These things happen. What separates a professional event from a chaotic one is not whether problems occur. It is how quickly they get resolved and how the room is managed while they do.
This guide covers the most common AV failures at live events, what causes them, and what to do when they happen. It also covers what to put in place before the event starts so that problems are smaller and faster to fix when they arise.
Before the event: what prevents problems becoming disasters
Most serious AV failures on the day trace back to something that was not checked before the event started. A sound check that was skipped. A spare microphone that was not requested. A laptop that was not tested with the room’s HDMI connection. A video file that was never checked on the actual playback system.
The best time to find an AV problem is during setup or sound check. Not during the CEO’s opening remarks.
Before any event with significant AV, make sure these things are confirmed:
- All wireless microphones are fully charged and frequency-checked
- Spare microphone units are ready and accessible at the mixing position
- Every video file has been played back on the actual playback system, not just a laptop
- All presenter laptops have been connected to the room system and tested
- The sound check has happened in the room, not just in a corridor
- The AV technician knows the programme running order
- There is a clear point of contact between the event organiser and the AV technician during the event
None of this is complicated. It just needs to happen before guests arrive.
The most common failures and what to do
Failure 01
Wireless microphone cuts out or drops signal
This is the most common AV problem at live events. The immediate fix is a spare microphone swapped in by the technician within fifteen seconds. The speaker either pauses briefly or continues speaking while the swap happens. The technician should have a spare unit within arm’s reach at the mixing desk. If no spare was requested, the options are limited: the speaker continues without amplification or the event pauses while the problem is diagnosed. Neither is good. Always request spare microphone units when booking for a live event.
Failure 02
Feedback squeal from the PA
Feedback happens when a microphone picks up sound from a speaker and amplifies it in a loop. The immediate response from the technician is to pull the gain down on the affected channel. This takes two seconds. What makes it slower is if the technician is not at the desk when it happens. An audio engineer should be at the mixing position whenever microphones are live. Not setting up something else. Not at the back of the room. At the desk. Feedback that runs for more than three or four seconds is almost always a crew positioning problem, not an equipment problem.
Failure 03
Screen goes black or loses signal
Most screen signal failures are connection issues between the presentation laptop and the AV system. The fix is usually checking the HDMI or display port connection, switching the laptop display output mode, or swapping the cable. This takes between thirty seconds and two minutes if the technician knows the system. While it is being fixed, the host or chair should keep the room engaged. A brief pause of a minute is survivable. A silent room staring at a blank screen for five minutes while nobody seems to be doing anything is not. Have a plan for who speaks when technical problems occur.
Failure 04
Video or audio playback does not work
A video that plays on a laptop but not through the room system is almost always a codec or format problem. The file works on the machine it was created on but the playback software on the AV system does not support that specific format. The fix at the point of failure is limited. If there is time, converting the file to a more universal format can work. If not, the video may have to be skipped or played directly from the presenter’s laptop with audio fed separately into the room PA. This problem is entirely preventable by testing the actual files on the actual playback system before the event starts.
Failure 05
Power failure to the AV system
A full power cut to the AV system is rare but more serious. The first check is whether it is a tripped circuit breaker, which is almost always the cause and takes about thirty seconds to reset. If the venue has a noise limiter and the system tripped it by exceeding the threshold, the limiter needs to be reset, usually by the venue staff rather than the AV company. If there is a genuine power supply failure beyond a tripped breaker, the options narrow quickly. Generator backup is the only reliable solution for high-stakes events where power cannot be risked.
Failure 06
Presenter laptop incompatibility
A presenter arrives with a laptop that does not connect to the room system. Mac versus Windows is not the issue it once was, but newer laptops with only USB-C ports and no HDMI output catch people out regularly. The fix is an adapter, which should be part of every AV kit bag. If the presenter’s laptop still does not work after adapters, transferring the presentation file to a backup laptop is the next option. This takes five to ten minutes if the file is accessible. Ask every presenter in advance what output ports their laptop has and confirm your AV company carries the necessary adapters.
How to manage the room while a problem is being fixed
This is the part that event organisers rarely plan for and should.
A thirty-second AV fix with a confident host who addresses the room briefly and keeps energy up is barely noticeable. The same thirty-second fix in complete silence with the host staring at the AV desk and visibly anxious feels like five minutes to the audience.
Brief your host or chair before the event on what to do if something goes wrong. The script is simple: acknowledge it briefly, keep a relaxed tone, and give the technician a moment to fix it. Something like “bear with us for just a moment” is enough. Apologising repeatedly or looking panicked signals to the room that this is a serious problem when it is usually not.
The event organiser should not attempt to fix AV problems themselves during the event. Your job during a live event is the room. The technician’s job is the equipment. Crossing those roles creates confusion and usually slows the fix down rather than speeding it up.
The difference between an AV failure that nobody remembers and one that defines the event in people’s minds is usually about thirty seconds and one calm person.
What to ask your AV company before the event
Before any significant event, confirm these things with your AV company:
- What spare equipment do you carry on the day and where will it be positioned?
- Who is the on-site contact if something goes wrong, and will they be at the mixing desk throughout?
- What is your process if a critical piece of equipment fails and cannot be repaired on site?
- Have you tested the connection between our presentation system and the room AV during setup?
- Is there a backup laptop available if a presenter’s machine does not connect?
A professional AV company will have answers to all of these. They will not be surprised by the questions. If an AV supplier seems uncertain about their contingency planning, that is information worth having before the day rather than after. See our services page and our post on whether you need an AV technician on the day for more on what professional event AV support looks like.
Common questions
Should the event organiser try to fix AV problems themselves?
No. Keep the programme moving and let the AV technician handle it. Trying to help without knowing the system can make things worse. The best thing an organiser can do is keep the room engaged while the fix happens.
How long does it take to fix a microphone failure on the day?
With a spare unit ready and a technician on site, swapping a failed wireless microphone takes about fifteen seconds. Without a spare, you are either waiting for a solution or continuing without amplification. Spare microphones are not optional at professional events.
Can a screen failure mid-event be fixed quickly?
It depends on the cause. A lost signal connection is usually fixable in under a minute. A hardware failure on the screen itself may not be fixable without a replacement unit. This is why redundancy in the signal chain matters for events where screen content is critical.
