PC does not wake up
 

I have posted this problem before but got no response that solved my problem.
I have the following set up: Turn off monitor=1 hour, turn off hard disk=2
hours, and system stand by=1 hour. During the day even after 2 hours it'll
turn by me pressing any key on the keyboard, however, in the morning or at
the end of the day would not and have to resort to pressing the power key,
turning it off and turning it back on(reboot) to get it going again. I was
wondering if anyone has any suggestion. Muck obliged!