New monitor shows nothing

Hi.
my monitor(resolution was set on 1920*1080 ) accidentally break(PC was off) .when I connected the new monitor to GPU (the new monitor is old using VGA ) and turned it on nothing happened even color of monitor's light didn't changed .
I connected the monitor to motherboard to test it and it worked (and resolution was on 1024) .
after that I connected monitor to GPU again and tried to go on safe-mod and low resolution mod buy f8 and arrows (with out I see any thing just guessed )but nothing happened .Any help will be appreciated.
sorry about bad English.
 
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