To those worried about running your comp(s) 24/7. Do Not worry about it!
IMO it is
much better to leave a machine running all the time instead of shutting it down and powering it back up each day. Thermal expansion at power-up and contraction at power-off can cause any of several problems over time. I've been able to 'repair' comps simply buy reseating RAM, drive cables and in one case a CPU in machines that get cycled on/off/on/off. True, some older windows OSs seem to need a warm boot every so often to keep the thing going, but if not in use they usually do fine.
My Win98 and NT4 systems have all been crunching RC5 non-stop for about 96 days now with
no problems at all. The local power grid is the governing factor around here

I always turn off my monitors though. In rare instance they have been implicated in fires, but its been quite a while since I heard of this happening. I just turn them off to save a little power.
Power consumption is minimal, especially with the monitor and speakers off. I guess my machines use about 40W/hr. Electricity here is $.10 Kwh or about $3.28/mo per machine. That's ~$2.20 more than running only 8/7 instead of 24/7,...
big deal. :Q You'll probably save more than that in repair costs.
A lot of folks have already joined in from looking at this thread. We welcome you all!!
Thanks!!
Geoff