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Monitor Blinking Constantly every 2-3 seconds

\015 My PCS 15" crt monitor is blinking every 2-3 seconds after long on the windows sometimes it gone black for a while near about 5 mins .\015\012there'e no problem regarding my power cable . i have intel 845 gv chipset board & updated it's driver .\015\012pls help me to sort out this problem\015

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Lower your refresh rate.
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