ubuntu 20.04 screen blinking (quick pay 5 stars)

ubuntu 20.04 screen blinking ? any ideas, please help me fix and I will pay! Please note there is hope we can mutually complete this task; we can leave each other nice comments and 5 stars for each? Been out of work; hope you can give me your best price for this small job, is $12 ok? if not how is the best price ? Please note project is due in two hours as this projects deadline, as this is needed asap from the time we start.