A transparent column has suddenly appeared on my screen, refuses to go after several restarts. Is it a hardware issue, or shall I reinstall Ubuntu.

What release of Ubuntu are you using...?
I don't think is Firefox related issue, try to change screen resolution.
Open a terminal form Applications->Accessories->Terminal.
Please copy and paste the result of:
sudo lspci
Type your user password when requested ( you don't see any typed char when you digit it) and then press enter.

thank you elart.it but I think its a hardware issue, thank you for you
answer.
"elart.it" <email address hidden> wrote: Your question #15103 on firefox in ubuntu changed:
https://answers.launchpad.net/ubuntu/+source/firefox/+question/15103

    Status: Open => Needs information

elart.it requested for more information:
What release of Ubuntu are you using...?
I don't think is Firefox related issue, try to change screen resolution.
Open a terminal form Applications->Accessories->Terminal.
Please copy and paste the result of:
sudo lspci
Type your user password when requested ( you don't see any typed char when you digit it) and then press enter.

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Please mark solved by yourself this question
Thank you.