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Hi AC - thanks for that - I've tried it though and the computer is still sleeping/hibernating - the power light still flashes when the PC is supposed to be switched off anyway, so I'm presuming that's what it's doing.
The only way that I can get it to power off completely is by pressing and holding the power button for a few seconds, which is fine occasionally, but I don't want to have to do that everytime as I think I'm right in saying that it isn't great for the PC?
Thanks for everyone's help so far!!