Dual ATI Radeon HD 4550 cards w/ 3 monitors; 2 secondary monitors disconnect randomly and lose all WIndows settings

Have a Dell OptiPlex 980 with (2) ATI Radeon HD 4550 video cards and 3 monitors connected to it (23" primary and 2 secondary).

At seemingly random times, the 2 secondary monitors just disconnect and shut off (not power, just signal).  This seems to happen mostly at idle times, but it just happened again while in use.  When it happens, I have to go back into settings and re-extend to them again and configure location, resolution, etc.

I've updated to the latest drivers via Dell's website, which were dated April 2010.

Any ideas?
SupermanTBAsked:
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Rob KnightConsultantCommented:
Hi,

Could it be a power managment setting?

Regards,


RobMobility.
SupermanTBAuthor Commented:
I will check on that this afternoon, but wouldn't a power management setting apply to all monitors, and not just the 2 secondary ones?  Also, would power management cause Windows to lose all of its settings relating to the monitors (resolution, extended desktop, location, etc)?
Rob KnightConsultantCommented:
Hi,

Could it be the ATI PowerPlay settings in Catalyst Control Manager?

Regards,


RobMobility.
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Rob KnightConsultantCommented:
Alternatively could it be the PCIe Link State Management setting in Advanced Power Settings? Consider turning this off.

Regards,


RobMobility.
Rob KnightConsultantCommented:
Hi,

The Link State Management could shut down the adapter altogether - when it comes back up, you may need to re-apply your desired settings for expanding desktops etc.

Regards,


RobMobility.
my_expertCommented:
Since you had done much on software end. I suspect it could be a hardware failure. You may want to contact Dell Tech Support to get graphic card swap/replace to eliminate this problem.

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SupermanTBAuthor Commented:
This is to be continued next week.  Dell agreed to replace the motherboard, power supply, and both video cards, but the service tech arrived this morning with a defective MB.

They will try again on Monday, I'll post what happens. Thanks for your help.
SupermanTBAuthor Commented:
Thanks guys.  DELL replaced the motherboard, graphics cards, and power supply, and it resolved this issue.
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