After a time my computer starts flashing it is resolved by turning off Thunderbird. There is no link to how long before the flashing starts.

After an unspecified time my computer starts flashing. I assumed it was a hardware problem but found that every time I switch off Thunderbird the flashing stops. If i turn it back on the flashing has stopped but eventually returns. There is no time link, it might be hours before the flashing starts. It is always resolved if I turn off Thunderbird. I have compacted folders, altered check for new email times. I cannot force the flashing to start.

In System Preferences > Startup Disk, select your internal hard drive by clicking on it. The trouble you are seeing is because the Mac is looking for a network to start from and can't find one. Point it to your hard drive instead.

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    Welcome to the discussions!
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    Ravi
    Message was edited by:
            Ravi Kanth Talagana

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