External Monitor Flickering on and off

Hello,

I have always used an external monitor when using windows vista and now that i have upgraded to windows 7 when i plug in my external monitor it flashes on and off. I have changed the refresh rate on the monitor and all it does is change how fast the external monitor flashes. Also, I had this problem when using windows vista and I changed a setting in windows task scheduler and it fixed it. Tried doing the same thing in 7 and the problem is still there. In addition, I tried using a different monitor cable and the problem is still there. If anyone has any solutions please please let me know.

Starting with the model of your monitor and system specs will help

Sorry
I am using a 17 inch lcd hyundai monitor as my external monitor through my vga port.. Also, my graphics card is a nvidia 8600M GT. My computer is a laptop and I have always loved having two monitor when I was running vista.

I had the same issue... about 5 minutes of flickering after booting up on my second monitor after upgrading to windows 7.

I fixed it by flashing the BIOS.

Actually ignore that. Still have the problem. Flashing the BIOS hasn't fixed it.

I had exactly the same problem with an ATI card and the solution was to turn off (uncheck) 'allow ATI overdrive'. I know you said you have a NVidia card, but maybe you have a similar setting somewhere? Anyhow, thought I would post my solution in case it helped somebody.