I’m having a weird problem with 2 brand new UPS’s. When I install it in one particular office it does not function properly. The computer is correctly plugged into the UPS (battery backup vs. surge suppression only). But, when I pull the plug from the wall the computer instantly shuts off. If I take that same UPS, install it in a different office, and then pull the plug, the computer stays on.
Both computers are exactly the same; two Dell OptiPlex 960 mini-towers with exactly the same hardware configuration. Both computers also have the same bios power-management settings and the same Windows power settings. The UPS is a brand new APC Back-UPS ES 650.
To troubleshoot, I have removed all devices except the computer and monitor from the UPS and it still powers down. I have checked the power setting in the bios and Windows. All settings are configured for never shut off.
Has anyone ever seen this? Does anyone have ANY ideas? This is totally stumping me.
Thanks!
