Dell 2407WFP MacBook Pro Power-Save

I've just picked up a Late 2011 MacBook Pro 13" and attempted to connect it to my Dell 2407WFP monitor, via DVI with a genuine Mini DisplayPort to DVI connector.
The monitor is working well as an extended desktop, however, when the system attempts to put the monitor(s) to sleep, the Dell gets stuck in a loop. It shows the "going into power-save mode" repeatedly, but never gets there.
The monitor does seem to correctly go into power-save when the system is shut-down.
I've read some similar threads, but none referring to this model.
Any help would be much appreciated

My Dell 2407wfp works fine with VGA, but I couldn't get it to work with DVI.  I narrowed the problem down to a faulty MiniDisplay Port to DVI adapter.  The Dynex brand one was not working properly and kept causing the monitor to attempt to enter power save mode.  (The Dynex adapter would get warm even when no cable was plugged into it!) I bought a genuine Apple adapter at Best Buy and now it works fine.  If that doesn't help try resetting PRAM (command-option-P-R  on start up).

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