All of my videos taht were stored in iPhoto have been converted into a still picture - the videos are gone! How can I get the videos back?

Hi kiyocko,

Are your photos stored in iCloud? If so, here's how you can download them:

"If you want to download a full-size copy of your photos and videos from the Photos app to your iPhone, iPad or iPod touch with iOS 10.3 or later or iPadOS, or your Mac with OS X Yosemite 10.10.3 or later, follow these steps.

On your iPhone, iPad, or iPod touch

1. Go to Settings > [your name].
2. Tap iCloud, then tap Photos.
3. Select Download and Keep Originals."

You can check out the full resource here: Download iCloud photos and videos - Apple Support

We hope this helps.

Take care.