My CPUs front panel power LED is flashing once after I powered on the UPS.
A 'TUCK' sound is also coming from my speakers.
Is that normal or is there any issue with my motherboard?

  • ...with your powersupply. – Ipor Sircer Sep 18 '18 at 6:40
  • What UPS do you have? Also, a power supply usually also have a power switch on the back that you can turn off. I would strongly advise doing that before turning on the ups. – LPChip Sep 18 '18 at 6:46
  • I Have Zebronics ZEB-U725 UPS. I dont have a switch in SMPS. – Harikrishnan Sep 18 '18 at 6:58
  • 1
    Does it do it without the ups? – Mokubai Sep 18 '18 at 7:42
  • Yes, I check it. it does – Harikrishnan Sep 18 '18 at 7:55

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