Sleeping issues

I have a newer HP desktop running windows 10. The shut down, hibernate, and sleep functions all work perfectly if I manually use them through the start menu. However, if I just walk away from the computer and it tries entering sleep-mode, the screen shuts off but the tower seems to remain powered. The fans on the tower continue to run the entire time. The computer wakes up from this mode just as quickly as it does if i manually put it to sleep. I have gone through the power settings with a comb and cannot figure it out.

There is no screen saver and the event logs looked normal. Unkown was listed under the wake source which I always just tap the keyboard to wake computer. I have usb wired keyboard and a usb wireless mouse. The display is set to turn off after 5 minutes and the computer is supposed to go to sleep after 10 minutes. I've shut off hybrid sleep, shutoff PCI Express link state power management, disabled usb selective suspend, disabled wake timers, and turn off hard disk after 20 minutes. I'll continue to browse threads and trying different options. Thanks for the response

I set the screen off and sleep times both to 5 minutes and it seemed to have worked. Could it have been some of the other basic power management settings that I tinkered with? yes, but hopefully this was an easy fix and it continues to work. Thanks dalchina