Officejet 8100 acts like it has a sleep mode, but I can't find any controls for that.

It will work correctly one day, but then when I try to use it the following day, nothing works, the power button fades in and out, but does nothing.  If I unplug the printer and plug it back in, it will work.  How do I fix it so it stays online all the time?

I too was looking for something similar.
Found what I needed here
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c03330508&cc=us&dlc=en&lc=en&product=5218794&tmp...
My issue was:
The Printer Turns Off Unexpectedly After Being Idle for a Period of Time
My fix. 
Use the following steps if you need to disable the Auto Power Off feature.
Open the HP software for your printer.
Double-click Printer Preferences .
Double-click Maintenance Tasks .
Click the Advanced Settings tab, and then click Change .
Select Never to disable the feature.
Click OK .

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