BIOS settings reseted to default after changing the case.

[Bomjik]

Hello! Recently bought a new case and moved my hardware there, also cleaned everything from dust with soft brush and vacuum. After i installed everything and turned on the computer it said that bios settings were reset to default including time and date, but i didn't take out cmos battery or clear CLRTC. Everything works fine, just as well as before, but i'm worried, maybe i did something wrong? Or is it normal in situation like this and i don't need to worry? I'm noob in all of this, built a pc for the first time myself and did it super carefully 😀 My mobo is z170-A. I appreciate your help!

 

[Lutfij]

If the system doesn't ask for a time and date input on your next/subsequent boot ups, then you're fine. Often times the system can experience this issue if you have a dead or dying CMOS battery that usually happens when a battery discharges(when in cold environments or left in storage).

If the issue persists, you may want to see if the motherboard has any cables that are making contact with bare metal(aka making a short) or if changing the CMOS battery with a fresh cell changes the issue.

 

[Bomjik]

If the system doesn't ask for a time and date input on your next/subsequent boot ups, then you're fine. Often times the system can experience this issue if you have a dead or dying CMOS battery that usually happens when a battery discharges(when in cold environments or left in storage).

If the issue persists, you may want to see if the motherboard has any cables that are making contact with bare metal(aka making a short) or if changing the CMOS battery with a fresh cell changes the issue.

I don't think that CMOS battery can be dead or dying because mobo is fairly new. The cables are also OK. It looks like everything is fine now, it happened only once at the first start-up. But i'll keep an eye on this. Thank you!

 

[DRagor]

There's a very simple way to test if this is battery problem. Turn off your machine, then turn off switch on PSU (or remove power cable from outlet) for several minutes. Turn machine on again, and if you have problem with battery, you'll either see the same BIOS prompt as you've seen before, or your date/time in Windows will be incorrect. If neither happens, then battery is most likely okay.