FCP 7.0 Strange Error

[vx1kOrnot]

Hello can someone please help me ,i was editing and then all of a sudden the window went black all i could hear was the sound from the audio on the timeline but could not see any video so i saved the project then did a restart now it takes 20 mins to load up only i cannot get past this window

Can someone please help asap i need to finish a project for a client

 

[BWyldeck]

Have you perhaps modified your quicktime file outside of FCP? Changed dimensions, rotated it (in Quicktime) or given it a different name? If so, change them back and start a new fcp project and copy the sequences to the new one.