Overload Issue When Mac's Asleep

Hello
I'm having an unusual problem. Twice now, if my Mac Pro is in sleep mode when the UPS does it's check, I get an overload error and the mac shuts down. Anyone else having this problem? No other devices are connected, monitor is off. If the mac is awake, no problem. The only apps running are Finder and the NDAS Utility (NAS is off)
Mac Pro (Early 2008)
4GB RAM
300GB (2); 1TB; 2TB HDDS
10.5.8
UPS is APC's 800VA, 540Watts
Any ideas?
Music Luver

Look up "inrush current" a Mac Pro when it comes out of sleep seems to cause one of those;
http://en.wikipedia.org/wiki/Inrush_current
and, as important or more, your UPS is on the verge of being too small, and there are enough reports of odd behavior from that. Plus having more headroom in terms of VA/Watts tends to not put as much stress on UPS and leads to longer life for its battery (I have a couple APC 1500s going strong after 5-7 yrs).
Use what you have for other equipment instead.
CyberPower has a nice 1300-1500VA in the $149+ bracket with trim and boost and more.
http://www.newegg.com/Product/Product.aspx?Item=42-102-048
The question comes up enough, sometimes it seems more turn into long threads and educational seminars.

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