My Mac Pro doesn't start on first button push.

Starting about 2 months ago, my Mac Pro won't power on unless I press the power button once, wait about 3 seconds to hear a click (as if something inside turned off), and then press it again.
There are no other noticable issues. I have the tower hooked up to a UPS, so I don't THINK it's the power supply (unless the clicking I'm hearing is the power supply resetting itself in some way). I've unplugged it completey, drained the battery, replaced the startup battery, reset PRAM / VRAM, all of the normal troubleshooting stuff, but it still requires this 2-button push to start up.
Any ideas as to what's going on?
Thanks!

https://support.apple.com/kb/HT1149

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