The UPS may not be sufficiently stable on power-on to run a PC immediately.
Try going into the BIOS setup after the restart and look for the option that has the computer "Start up automatically after power failure." Turn this off. That will take care of problem 1.
If this also takes care of problem 2, you may want to check whether the UPS has a problem. Start by plugging a couple of lamps with 100 Watt bulbs into the UPS outlets instead of the computer. Turn it on - the lamps should behave normally, not flicker or change brightness. With the lamps and UPS still on, unplug the UPS. The lamps should stay on with little or no change, and the battery warning light should not come on right away. If the UPS fails this test, its battery may need to be replaced or it has a regulator problem.
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