My pooter died yesterday

My new (to me) pooter died, it refused to shut down and when I forced a shut down it wouldn't switch back on again, I took it back to the shop and they've resurected it, but I'm not that confident about it really being OK, so if I disapear for a few days that will be why. For some reasons programs that had no business to running at all let alone in the background were running or trying to and wouldn't shut up.