The mystery of the flashing screen -suggestions please.

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The mystery of the flashing screen continues . I thought I had got rid of the screen flashing brighter and darker by shutting down instead of going into hibernation or sleep mode. Well that worked for a while. Load Firefox the flashing starts. Load Thunderbird flashing continues. Close Firefox and reopen the flashing has stopped.

Any suggestions. I don't really want to have to change browsers as Firefox suits me fine.