At the office where I work, people leave their computers on all night, all weekend (even three day weekends), and it doesn't seem to bother them at all. I was at work yesterday, and about 20 computers were still on, and left on all weekend! Despite the environmental, conservation aspects, about how much money should it cost on average to leave an average office computer on full power (no energy standby) with screen saver on per hour? Tell me that, and I'll do the math for the rest of it.. If one of you could just give me a very rough estimate, I'd really appreciate it.