Quote:
Isabel,
I had the exact problem you describe. I have a Dell XPS 420 with Intel Core 2 Quad core Q6600 processor running at 2.4Ghz, 4 GB RAM, and an ATI Radeon HD 4200 XT graphics card.
Isabel
I could hear the audio but the video window was blank when trying to play from the timeline. Sometimes when viewing media clips individually from the collection above the timeline, video would play but not from the timeline.
The culprit was the ATI graphics card. The 256MB memory on the graphics card was not enough.
I replaced the ATI card with an Nvidia GeForce 8800GT that had 512MB of memory and that solved the problem.
I was attempting to edit AVCHD from the Canon HF100.
If you would post the specs on your XPS 420 here, others may have suggestions to offer.