COMPUTER display HELP< PLEASE?!?

Q: my "back" button on the top left hand-corner has dissappeared.Also, most of the time whatever I am on only shows on half of the monitor. The other half of the monitor is completely white, therfore; causing me to scroll left and right on something that should only be on one page. Please if anyone knows how i may fix this, PLEASE be very specific. I am not very computer literate. Thank you very much!

A: it might be an easy fix or it might be expensive to fix cost to fix most shops have a base diagnostics fee any where from 20 bux and up repairs maybe 20 bux and up new parts will range from 20 bux and up is it worth it maybe but new part maybe cheaper just to little info to determine for sure

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