Can someone answer this for me? I purchased an optical mouse for the kids computer that also has flashing lights inside it as well (classy I know!). How come it flashes away even when the computer is switched off, but pull it out of the ps2 connector and it stops. Is it bypassing the computer power somehow and drawing the eleccy straight from the mains? The kids cant get to sleep at night without thinking they are down the local night club!!!!