My new computer would not go into standby for more than a second. I turned off all the wake-on-LAN options in the BIOS, still no luck. Then I had a look at the device manager: The entry for my network card has extra power management settings that override the BIOS ones: Turn those off as well.
Now the computer went to sleep, but the fans continued to run. Not good. More poking around in the device manager finds a power tab on the keyboard and mouse: Turn off the option to let those devices wake the computer from standby, and voila! the fans stop. Now the only way to wake it up is the power button, but that’s fair enough.
Why did this have to be so hard?