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refresh rate windows 7

Hello:

I have a Sony Vaio with Nvidia graphics card and is connected to an Acer LCD monitor with RGB cable. I've tried to change refresh rate but I can't select more than 60 Hz so the image in the monitor blinks.
The extrange thing is that the fisrt day I started the laptop, I could see 75 Hz and all went ok. But now, I only can see 59 and 60 Hz.
Is there any option in the registry can I change or any other possibility?

Thank you.
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danigome
Asked:
danigome
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1 Solution
 
Tim PalmerLevel 3 Escalation TechCommented:
check to make sure your display drivers are installed correctly.
maybe try installing the latest nvidia drivers from www.nvidia.com too
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danigomeAuthor Commented:
I have the latest drivers installed and I can't select any other refresh rate than 60 Hz.
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dbruntonCommented:
Well, see http://en.wikipedia.org/wiki/Refresh_rate#Liquid_crystal_displays

See the section below called Computer Displays where you will find

"Windows NT-based operating systems, such as Windows 2000 and its descendants Windows XP, Windows Vista and Windows 7, set the default refresh rate to a "conservative" rate, usually 60 Hz."

This link http://en.wikipedia.org/wiki/Frame_rate#Frame_rates_in_video_games states that LCD displays are locked to 60 frames per second which is 60 Hz.

I can find links to Acer LCD products where refresh rates of 75 Hz are quoted but everyone is getting only 60 Hz.  Yours is not the only question on this matter and there is not satisfactory answer.  I'm suspecting that Windows is locking it down.  

 
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Tim PalmerLevel 3 Escalation TechCommented:
I understood that human eyes can't see that fast anyway, and "refresh rate" refers to CRT days where the electron gun fired from top to bottom.

LCD monitors talk in ms grey to grey response time, the lower the better.
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danigomeAuthor Commented:
As I said, I could setp up 75 Hz only one time and the image was perfect in LCD monitor. But the next day, when I started the laptop I only could select 60 Hz and the image blinked.
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dbruntonCommented:
Noted but Windows may have taken over since then and removed the 75 Hz setting.

It is also possible that you may get the 75 Hz setting at a lower resolution.

See http://en.community.dell.com/support-forums/peripherals/f/3529/t/19321674.aspx for an example of this.

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danigomeAuthor Commented:
Is there any option to recover 75 Hz again at max resolution modifying the Windows registry?
I tried a lower resolution, as you said, and I can select 75 Hz but the image is not as the first day. It appears distorted and blinks.
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dbruntonCommented:
Standard practice on monitors to have low refresh rate on high resolution and high refresh rate on low resolution.

You could try the following utils and see if they can override the settings in your system.  Be cautious if you use them.

Rivatuner http://www.guru3d.com/index.php?page=rivatuner
Powerstrip (shareware) http://entechtaiwan.com/util/ps.shtm
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danigomeAuthor Commented:
Thanks for the information but I've tried the utils and I haven't could override the refresh rate.
I think Windows 7 is blocking the original refresh rate values and I hope to find the way to unlonck them.
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dbruntonCommented:
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