I had Windows 7 x64 Enterprise loaded on a Dell OptiPlex 755 w/ ATI Radeon HD 2400 XT. I have (2) Dell monitors set up and periodically the system will blink the second monitor out and back on. I have just reloaded my system from scratch and changed from Win7 x32 to x64 and downloaded all the latest drivers but the problem continues. I have seen several articals regarding this type of problem but so far have not found any way to get the blinking to stop. Any suggestions?

Hi, This should be a hardware issue, but not a Windows problem. Do you connect the second monitor with the HDTV port? If so, please refer the following support article. NoVideoOnHDTV Important Note: Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information. The FAQs for this model will be also helpful. AMD Support Search Also please let us know if the latest driver is downloaded from the following website. ATI Catalyst™ Display Driver If all of the above do not help, I suggest you contact AMD support for further assistances. Contact Us at AMD Arthur Xie - MSFT

Here are some pieces of information I should have given - sorry about the omission Dell OptiPlex 755 w/4gb RAM ATI Radion HD 2400 XT (2) Dell 19" monitors connected with the included Y-cable using DVI-D connector Windows 7 Enterprise x64 (but was also happening under the x32 edition) The Driver shows version 8.741.0.0 and was the latest version from ATI. The load was a default load with only the add-on games being omitted. I have looked thru most of ATI web information and will go back and look at the site again. In addition I have contacted Dell to see if this is a reported problem or possibly if I might just have a bad card.

Have you tried not using the Y-cable?- JoelbX

Have to - this card has a propriatery connector that splits the signal for the two monitors.

Have you tried using a new Y cable?- JoelbX