Why does my video not play while audio does?

Using iMovie 9 found that after bringing a clip from clips pane into my project that I could no longer insert or edit the project. The green insert cursor remained but all was frozen. After quitting, video clips in project pane will not play while audio (both audio from the actual clips and music) does play. When mouse hovers/scrubs over the clips in the project pane the video clips do come alive but not when i press space bar or play buttons (play full screen /play project from beginning buttons) in bottom left of window. Strangely video in clips pane do play when I press space bar.
I tried creating a new project and importing clips but no video will play. Same thing applies to all my imovie projects. Another strange thing, the other projects will play when I click on Play Fullscreen button but not my most recent project. Instead, when I click Play full screen button the Last (ie. last in alphabeitical order) of my projects plays instead!
I would really appreciate some help with this. Have spent a lot of hours on the project and seems like I can't even start again.

- Try cleaning out/blowing out the headphone jack. Try inserting/removing the plug a dozen times or so. There is a little switch in the headphone jack that disconnects the speaker when the headphone jack is inserted.
Try the following to rule out a software problem
- Reset the iPod. Nothing will be lost
Reset iPod touch: Hold down the On/Off button and the Home button at the same time for at
least ten seconds, until the Apple logo appears.
- Reset all settings
Go to Settings > General > Reset and tap Reset All Settings.
All your preferences and settings are reset. Information (such as contacts and calendars) and media (such as songs and videos) aren’t affected.
- Restore from backup
- Restore to factory settings/new iPod.
- Make an appointment at the Genius Bar of an Apple store. Seems you have a bad headphone jack.
Apple Retail Store - Genius Bar
If not under warranty Apple will exchange your iPod for a refurbished one for this price. They do not fix yours.
Apple - iPod Repair price
A third-party place like the following will replace the jack for less. Google for more.
iPhone Repair, Service & Parts: iPod Touch, iPad, MacBook Pro Screens
Replace the jack yourself
iPod Touch Repair – iFixit

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Why does my video not play while audio does?

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