I have a Dell Inspiron 530 and Vista - I've got a hibernate shortcut that I use to send the PC into a very low power state. This function has worked just fine on many occasions, yet recently when I hibernate the PC switches itself back on again! It does this about 1 min after hibernating, then it will stay on for 5 mins, go to 'sleep' (which is what it's set to do) and then switches on again!

I've tried closing all open programmes and it still does it.

it's a mystry to me! :confused:

Certain hardware, like LAN cards or modems can "wake" a PC from its slumber if they are set to do so.

If the PC is connected to a LAN cable, try disconnecting it and see if the PC stays "asleep".

If so, there might be a bios setting such as "Wake on LAN" that you can disable.

I found that unless I turn my optical mouse upside down, mine sometimes swtches itself on too. Just a slight movement can set it off.

@Space.

Here's something you can try.

Go to the device manager and select your mouse, Right click and select properties. Find "Power Management" and see if "Allow this device to bring the compter out of standby" is ticked.

Actually, alicat_26 could try the same with his/her LAN card.

@Space.

Here's something you can try.

Go to the device manager and select your mouse, Right click and select properties. Find "Power Management" and see if "Allow this device to bring the compter out of standby" is ticked.

Actually, alicat_26 could try the same with his/her LAN card.

Thanks Agrajag! Works a treat! :)