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Why o Why won't My monitor resume after exiting sleep mode in Vista

I have a machine running Windows Vista Business x64 with a Radeon HD 2400 Pro video card, the monitor is an Acer  X243W.  I'd like to get this working the machine is about 4 months old and has had this problem since I got it.

When Vista exits from sleep mode the monitor does not display anything until I power the Monitor off and then on again.  I loaded the latest drivers for the video card and made sure all fixes have been applied for Vista.  Acer claims the problem is not theirs and is ignoring my messages to them.

The primary question is the above but the last questions I had for Acer follow and may help solve the problem

1). When the machine goes to sleep what at causes the power light to go from blue to amber
2). When coming out of sleep mode what computer component is responsible for notifying the monitor power button to go blue and the monitor to come out of the "No Signal" mode
3). The last response that I got from acer refered to using a VGA cord for their diagnostics, the HD 2400 is a Digital card, would there have been any significance to their request to use a VGA cable as apposed to using the Digital connection

Thanks for the help
1 Solution
I had the same problem with one of my Dell monitors in a dual monitors setup on both 64-bit Vista and 64-bit 7, having Dell replace the monitor fixed the issue for me. I'd attach the monitor to another system if possible and see if it still occurs.
VGA monitors communicate with the computer by way of a signal called DDC.
There are multiple versions of DDC.

DVI monitors can use DDC to communicate but they can also use EDID instead.

I think the manufacturer suspects an incompatibility between DCC/EDID versions between the graphics card and the monitor in question with DVI and they want you to try a VGA cable to change the communication method.
c7c4c7Author Commented:
Great answer to all of the questions.  The graphics card was the problem

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