Previously (in the last month), suspend worked as intended when manually selecting the button, or when idle timeout.

Now, the following happens:

Select suspend from the XFCE logout panel.
The system enters suspend state.
Immediately the CDROM self test and Hard Disks are spun up like a system reboot has occured.
The system resumes its normal state as if I had never selected anything.
I select SUSPEND again, the system suspends normally, wakes on keypress normally.

I don't know why I have to press it twice now, when I didn't before.  I haven't updated any software in months.
The only change I made was to the bios fan control points after removing a fan.

Thoughts?