[andygrif]

Thanks for all your replies so far.....

Originally Posted by scastle

Could AVG be waking the system up to check for updates?

Having said that uninstalling AVG stops it happening, I uninstalled again last night....and it's restarting again. Very confused now!!

Originally Posted by nffc

Do you have Automatically Restart checked in System Properties --> Advanced --> system failure (or wherever)? Because it seems to me like the PC's crashing, but instead of displaying the BSD (which you can use for debug) it's restarting because that's how it's been set up.

Tried that, as I didn't think of that one before. Restart is not checked though.

Originally Posted by SMHarman

Could it be the little button that gets pressed when you shut the lid that tells it to go into standby mode is fubared?

Like your lateral thinking SMH! Not the case this time though, it even does it with lid open. Good idea though.

Originally Posted by Raistlin

Is there an option in the Power Management settings (or possibly in the BIOS) that says something like "Wake On LAN"? If there is you may want to set this to "No" or "Disabled".

and

Originally Posted by jrhnewark

Probably the Wake On LAN setting (most likely in the BIOS) that's doing it. My computer does the same thing.

This shouldn't be the case as it does it even when the wireless card has been removed, but I'll check it out later anyway. I seem to remember checking this last year when it first started and disabling WOL then, but I'll make sure this evening!

Thanks again folks....any other suggestions?