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That's a bit hard to follow. Is this what you mean?
You have the computer and the LCD plugged into battery packed sockets on the UPS?
The CRT is not plugged into the UPS?
Turning on the CRT causes the UPS to reboot the PC?
Some possibilities spring to mind. There might be more.
1. The UPS is faulty. The brown out from turning on the CRT should not be deep enough or long enough for the UPS to decide it has lost power and tell the PC to shut down. If the UPS has sockets which are filtered but not battery backed up try plugging the CRT in there and see if it makes any difference. That is what I do.
2. The UPS software on the PC has been set to power off immediately on loss of power. It makes more sense to be set to power off when the batteries fall below some threshold, say 2 minutes power left.
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