Hi

When i push the POWER button my PC starts then cuts out for 2 seconds then starts. I beleive this is causing it to boot to the BIOS screen each time where i have to choose to keep or discard my settings to get into Windows.

Once in windows all is fine. I havent changed the BIOS since the barebones pc was bought in 2016 and it worked fine for nearly 2 YEARS since. Checking my BIOS settings it doesn't look like anything was accidently changed. My Power supply is a good brand - EVGA 1000w bought from new. Motherboard is ASUS. What is causing this??

heres some specs:-

OS NameMicrosoft Windows 10 Home
Version10.0.17134 Build 17134
Other OS DESCRIPTION Not Available
OS ManufacturerMicrosoft Corporation
System NameDESKTOP-GG1S19J
System ManufacturerNOVATECH LTD
System ModelBB-X000744
System Typex64-based PC
System SKUBB-X000744
ProcessorIntel(R) Core(TM) i7-6700K CPU @ 4.00GHz, 4001 Mhz, 4 Core(s), 8 Logical Processor(s)
BIOS Version/DateAmerican Megatrends INC. 0801, 31/08/2015
SMBIOS Version3.0
Embedded Controller Version255.255
BIOS ModeLegacy
BaseBoard ManufacturerASUSTeK COMPUTER INC.
Installed Physical Memory (RAM)16.0 GB
Total Physical Memory15.9 GB
Available Physical Memory10.5 GB
Total Virtual Memory18.3 GB

Sometimes the 2032 battery can cause issues like this. I'd go into the BIOS and write down any settings you have that are custom and replace the battery and then once battery replaced then go in and verify that the settings are back to correct if custom configured from the default settings. Battery voltage should measure at least 3 Volts DC any measurement lesser than 3 Volts and toss it and put in a new battery.

Other cause for this would be if an overclock condition was not stable it will default to normal clock settings to attempt to boot healthy on the 2nd attempt.

I have had a weak 2032 battery cause weirdness like your dealing with and when looking in BIOS settings all looked well, but the battery measured like 2.84 volts when I tested it. Once I put in a new Energizer 2032 voltage was 3.06 and problem went away.Question.
What is this?
BIOS Mode Legacy
If it was made in 2015 it would not need legacy mode. Unless it was used or some other OS. Did you want legacy mode?Thanks for the reply, i did notice "legacy mode" on the spec list, does this MEAN something is outdated? If so how would i change this? Ill change the battery and see what happens as wellJust changed the 2032 battery, seems to have worked