I've tried the tweak with Local and Current keys, and did successfully see that sleep had been greyed out. As it is after an hour or so with the PC still on it had un-grayed itself, and now refuses to go back to being greyed out.
I've checked and double checked that the keys are correctly named etc and have deleted them, and re-created them but no luck. I even tried creating the Qword 64 bit ACSettingIndex but this didn't work.
The laptop is a month old and it's Windows 7 Home Edition.
Any idea why this won't work for me?
Thanks in advance.