For basic editing, AVS Video Editor is a great choice: It's also free trial, so that's always nice.
Monitor Video Signal Problem - What can cause problems with your Monitor's Video Relay?
Usually the video cable or the video card. A faulty graphic card driver can also cause image distortions, but that's a software defect that can be fixed by upgrading or re-installing the driver.
Does audio sync means the video is making blurry sounds along with the regular video sounds?
No it means the audio is in time with the video.If you have sync problems then your picture and audio are out of sync.
I am making a video...?
right click the audio clip under the video clip and click mute
How to Remedy Common Problems With Making Injera?
How to troubleshoot things that go wrong when making injera.