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HDD LED and fan led started to flash after turning on the UPS

Jul 9, 2012
70 (0.04/day)
Processor I5 4570 3.2 GHZ
Motherboard MSI H87-G43M
Memory 2X 4GB Corsair Vengeance
Video Card(s) XFX r7 265 Core Edition 2GB
Storage Wester Digital Caviar Black 1002FAEX 1 TB
Power Supply OCZ Fatal1ty 550w
Software Windows 10 64 bit
That has never happened before, I was able to turn my pc on but thats something I couldnt ignore.

What could it be?
Last edited:
Oct 12, 2008
5,654 (1.69/day)
στο άλφα έως ωμέγα
System Name Ha/AhHa/Dell
Processor QX9650 SLAWN C1/i7-980x/i7-6700K
Motherboard GA-X48_DS4 (F3B bios)/Gigabyte x58A-UDR3 v 2.0(modded FH bios)/Dell Foxconn 0XJ8C4 Z170
Cooling CNPS9900 LED/H60/ 3 pipe-center fan-air
Memory 8 Gig of G.Skill F2-8800CL5D/24 Gb Corsair Vengence/ 24Gb Samsung DDR4 2133
Video Card(s) Galaxy NVIDIA GeForce GTX 960/PowerColor R9 280/ASUS R9 380X Strix G1
Storage All have SSDs with HDDs for extra storage and backup/Dell-M.2 Samsung 850 EVO PCIe
Display(s) Asus 266H/Viewsonic 1080p/HP ZR24W
Case CM-690/CM-690 II adv/Dell 8900 series
Audio Device(s) All use on board (Realtek) w/2.1 speakers
Power Supply PC P&C 750/PC P&C Silencer 950/CM 700 Extreme
Mouse Logitech
Keyboard Logitech
Software Windows 10 Pro - 64 bit/Windows 10 Pro - 64bit/Windows 10 Pro - 64bit
Here is a couple of things you may want to check on.
You may need a meter to do some of this; and, know how to use it properly!

What UPS?
Is the battery good in the UPS?
Is it true or clipped sine wave?
Any other suppressors or filters on the line anywhere?
Good grounding or any/no grounding?
How many devices(what devices) are connected to the UPS?
What is your power source (generator, electric grid, etc.) ?
Is it using auto-sensing for voltage or do you need to set it manually?
If you take the UPS out of the equation... does it still have these problems, now?
How is the voltage & current at the point where you are connecting the UPS?
Did you try re-setting the motherboard and check your voltages at the PSU with the UPS plugged in and with the PC plugged straight to the source(socket/wall plug)?