I didn't eject my Flip from my Mac but pulled it out of the USB slot and got the Alert message about ejecting it first. Now when I plug the Flip back in, it crashes. I've deleted all of the files (copied them before the crash), took out the batteries, restarted it, dumped the trash, and it's still crashes. M'aidez, m'aidez!

SOURCE: USB Unplug Crash!(for a Flip Video Camcorder Mono HD)

this happened to me a few days ago, what you have to do is hold down the off button for 20 seconds. This technique is called hard reset, so it should work if you do that. :)

SOURCE: Flip giving a Connected signal and no video

Wow, how did you remove the batteries? I don't know how to get the case open... can you help?
I think I have a solution for your problem... on the bottom of the camera where you would screw in a tripod there is a reset "hole". Take a small paperclip and stick it in the reset hole for a count of seven.... rinse and repeat... just kidding. Do that about three times giving it a few moments between.
DCE

SOURCE: Brand new Flip freezes my laptop!

Mp4Clipper::OpenInputFile could not open file

SOURCE: Flip video camcorder says camcorder full and then camcorder empty

Thanks...I emptied by trash folder and it solved the problem. Please note I had the flip CONNECTED to the mac when I did this. I then ejected the flip (didn't just remove).

SOURCE: FLIP ULTRA FILES DELETED, CAN THEY BE RESTORED

The answer is YES. You have chance but not 100% sure.

First things first: DO NOT take any more videos with the memory card or hard disk (on your camcorder) that you want to recover videos from. Take the memory card or disk out of your cam and put it in a safe place. Because if you take any more videos or save any data to your memory card or hard disk, you may quite possibly ruin your chances of video recovery.

Then Connect the card or disk to your computer as it should appear as a "Removable Drive" or put the card in a card reader attached to your PC.

Next, if you are comfortable with using a PC then you can download a data recovery utility that will recover your videos with Wondershare Recovery Software (I once used this program bounded with some other software) from the following link:

Mac Data Recovery (from MacUpdate site)

Remember - Do NOT try & write anything back to your camcoder(card or disk) until you can recover your videos safely!