ACD sleep indicator light not pulsing

I installed Windows Vista Home Basic on my Mac Pro yesterday. My display is a 20" ACD (aluminium).
Since this Vista installation, the indicator light on the ACD does not pulse during sleep, but remains on steadily. The front indicator light on the Mac does pulse as normal during sleep.
In both instances, this indicator light is off as normal on both the Mac and the ACD while the Mac is being used.
Is this an issue others have seen, and does it have any negative indications?

In Displays/Option, the Display Power Button preference had been set to 'Turns the display on and off' and this had caused the problem I described earlier. I am not sure why this option had been selected after the installation of Vista yesterday, because I didn't open Preferences during or after this installation.
I have now changed the option to 'Puts the system to sleep or wakes it'. This is the option I normally use and I was not actually aware it caused the display sleep light to pulse.
The display has now returned to the more usual state (for me) of gently pulsing.
Thank you, Malcolm, you have been very helpful.

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I have a 15.4-inch MacBook Pro 2.8 GHz (Late 2009) and recently I have noticed some issues involving the sleep indicator light and my Mac sleeping.
I learned that the sleep indicator light is supposed to be on when you press the power button until the chime sounds and then its supposed to be recognized when the computer sleeps or when the lid is closed.
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Message was edited by: studabaker
Message was edited by: studabaker

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Manufacturer: SMP
Device name: bq20z451
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PCB Lot Code: 0000
Firmware Version: 0003
Hardware Revision: 0003
Cell Revision: 0100
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Fully charged:No
Charging: Yes
Full charge capacity (mAh): 6662
Health Information:
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Condition: Normal
Battery Installed: Yes
Amperage (mA): 3177
Voltage (mV): 12109
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System Sleep Timer (Minutes): 15
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 15
Wake On AC Change: No
Wake On Clamshell Open: Yes
Wake On LAN: No
Current Power Source: Yes
Display Sleep Uses Dim: Yes
GPUSwitch: 2
Battery Power:
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Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 2
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Wattage (W): 85
Revision: 0x0000
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<Serial Number Edited by Host>

studabaker wrote:
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Because you have a long wait for access to an Apple Authorized Service Provider, if you merely clicked "erase" (the one that does not take more than an hour), you could try Secure Erase now if you want to try the final possible fix you can do on your own.
... and installed the combo update recently, the size for that update was over 1GB.
That is the right one.
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****Click the White thumb to say thanks****
****Please mark Accept As Solution if it solves your problem****
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ACD sleep indicator light not pulsing

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