One specific presentation half-loads then PowerPoint hangs, shows 'Not Responding', or crashes — every other file opens fine.

What's actually wrong

When PowerPoint itself is healthy but one particular deck reliably hangs it partway through loading, the file contains something the parser enters but never exits — most often a damaged embedded video or audio stream, a corrupt image, a broken chart or OLE object, or one mangled slide's XML. The good news: the rest of the deck is usually completely intact, and the job is isolating the one poisoned element rather than treating the whole file as lost.

Free fixes — try these first

1. Start PowerPoint in Safe Mode: Win+R, type powerpnt /safe, then File > Open the deck. Safe Mode disables add-ins and hardware graphics acceleration, which unsticks a surprising number of 'corrupt' files.
2. Use File > Open > Browse, select the file once, click the arrow on the Open button, choose Open and Repair.
3. Upload the file to PowerPoint for the web (OneDrive) or Google Slides — the online renderers skip features that hang the desktop app, letting you at least view and copy your content out.
4. Isolate the poisoned slide: create a blank deck and use Home > New Slide > Reuse Slides to pull slides in batches (1-10, 11-20, ...). The batch that hangs contains the damaged element; re-import that batch one slide at a time.
5. If a specific slide with a video or audio clip is the culprit, delete the clip, re-encode the source as MP4 (H.264/AAC), and re-insert it — corrupt or exotically-encoded media is the most common single-file crasher.

If the free fixes fail

If the file hangs every viewer — desktop, web, and Slides — the damage sits in a part they all try to load before showing you anything. Our analyzer never 'plays' the file; it statically inspects each part of the package, names the exact slide or media stream that's broken, and shows what percentage opens cleanly with the damaged element quarantined.