Monitors UPS trips with only CPU but runs ok with Monitor + Speaker + printer

M

mk76

Skilled
Microtek 800VA UPS trips on power cut leading to hard PC turnoff.

I tested and found that when only monitor (BenqE2200) + 2.1 speaker + printer are connected UPS is able to switch over and run fine.

But when, only the CPU tower (Corsair 450VX + 3 HDD + HD4580) is connected, the UPS is not able to switch over and PC reboots.

I ordered a new UPS (Microtek 625VA) and it behaved exactly in the same manner as above.

Any idea what to do?
 
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