@JaredBusch said in Laser printer sometimes trips an APC and shuts off computer??:
The UPS is failing.
As mentioned there is some other underlying power problem if a laser printer kicking on is causing a severe power voltage drop.
But even still, the UPS is designed for this purpose and failing.
Buy a new one.
I bet you that the UPS is failing because of the recurring problems with the electrical. Basically, the APC is crappy and it was made to perform more work than it was willing to do so now it's just toast.