Can you provide the following system information for me please?
+ What CPU are you using?
+ What display adapter do you have?
+ Are you running Windows 7 64 or 32 bit?
Thanks for replying. I'm using Windows 7 profesional 32 bit. The CPU is Intel Core 2 Duo E7500 and the graphics card is embedded in the motherboard - it's an HP Compaq Elite 8000 SFF Business PC
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I would recommend updating your BIOS, and possibly switching back to the OEM provided/supported GFX drivers (18.104.22.1682 according to HP's website). The link below has the download for your BIOS update and GFX driver update.
Go ahead and give those a try, and let me know if this fixes the issue or not.
I've done both. I'll wait til tomorrow as the problem usually happens overnight
New drivers and new BIOS had no effect. In the end I have had to turn power saving sleep mode off via group policy and so it never turns the monitors off and I no longer see the problem
Thanks for your help anyway