Sun monitor is getting to blur

I am using a sun monitor for PC, tonight my son adjusted some button on the monitor, now the monitor got to blur, I can't read screen clearly and the eyes feels very tired if looking on scrren little time, does anyone help me to retrieve monitor?
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mikezangAsked:
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jhanceConnect With a Mentor Commented:
Based on your description I suspect the CONVERGENCE adjustment is changed.  You've not specified which SUN display model this is so I can only give you a generic description.  Enter the monitor's SETUP mode and select the CONVERGENCE option. Adjust it until things clear up.
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mikezangAuthor Commented:
it is GDM-17E20, it seems there is no convergence button, can you help me?
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jhanceCommented:
Does this thing have a "soft" (i.e. onscreen) setup mode?
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mikezangAuthor Commented:
yes!
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mikezangAuthor Commented:
I am using a Thinkpad.
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jhanceCommented:
Forget it.  
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mikezangAuthor Commented:
Do you have any idea?
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mikezangAuthor Commented:
Thanks, I got it!
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mikezangAuthor Commented:
But I don't know why:(
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mikezangAuthor Commented:
Now I found the reason, but I don't know how to call that button in English. That value is equal 100, but normal value is 50.
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