A screenwriter has just finished his winning screenplay for the pitching time. Suddenly, his computer breaks down and he loses every piece of his work.

This logline doesn't describe a plot as it doesn't have a goal for the main character, rather it hints at a goal - retrieve the writer's work.

In a logline best to definitively describe the plot at hand, this means an inciting incident, main character and goal.

Here is a little helpful guide:
https://loglines.org/howto/

On a side note please refrain from posting more loglines for feedback than loglines you have reviewed your self.
It looks like you are a new user so all good for now, am sure other members will be happy to review, but please bare this in mind for future posts.

This logline doesn't describe a plot as it doesn't have a goal for the main character, rather it hints at a goal - retrieve the writer's work.

In a logline best to definitively describe the plot at hand, this means an inciting incident, main character and goal.

Here is a little helpful guide:
https://staging.loglineit.com/howto/

On a side note please refrain from posting more loglines for feedback than loglines you have reviewed your self.
It looks like you are a new user so all good for now, am sure other members will be happy to review, but please bare this in mind for future posts.

This is a set-up not a story.

"When a screenwriter's computer breaks and he loses his million dollar script, he must..." ?(Then tell us what he must do)

Hope that helps.