My Dell computer running Win 7 & IE has sleep problem. When you close the lid it sleeps. When the lid is up with or without a web page up--it has a mind of its own, sometimes the screen saver,display dimming,display off, and sleep works properly but most of the time it doesn't.
1-screen saver set @10 min
2-display dimming set@15 min
3-display off set@ 20 min
4-sleep set @ 30 min

any help is appreciated-