Needs cmos reset every time to boot

tylerjrb

tylerjrb

Member
I've installed a new cooler for my brother (old h100i). But upon powering it it wouldn't go. I.e power button did nothing. Anyway reset the CMOS and left the battery out for 10 or so minutes. And it fired into life. Happy I ran a few tests and all ran well with the new cooler (thought it just needed a CMOS reset). Switched it off and come back later and again power button did nothing. Reset cmos again and it works fine. I can shut it down and it will turn on no problem. But as soon as the power is switched off (green led on mobo goes out) I switch the Psu back on and it needs the cmos resetting again.

I've tried updating the bios, swapping cmos battery for a known working one, removing Gpu, ram etc but nothing worked. I'm fearing I might have damaged something on the mobo.

I just thought I'd ask incase someone had any advice. Thanks.
 
johnb35 said:
Why are you turning psu switch off?
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I don't normally leave the pc on, I normally switch off at the wall everytime I leave the room etc. I do that and it messes it up and the cmos needs to be reset to get the board to work correctly again.

I'm pretty sure my brother never does but as I usually have many things connected to a surge protector. Tv, PC, Xbox, tv box. I don't like to leave it all on standby.
 
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You should have no worries leaving the system plugged in and psu switch turned on. Turning the switch off you are shutting power off to the board and it's making it screw up. Now it's possible something is up with the motherboard or cmos battery socket. Is there a bios update available?
 
johnb35 said:
You should have no worries leaving the system plugged in and psu switch turned on. Turning the switch off you are shutting power off to the board and it's making it screw up. Now it's possible something is up with the motherboard or cmos battery socket. Is there a bios update available?
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the cmos battery should hold the settings surely? with my pc i turn it off everyday via the wall and dont have a problem like this. I have updated the bios and it has not made any difference.

We also have recently found that the pc hasnt been switched off at the wall for several months and the surge protector was not working during this time, im guessing possibly causing this problem (damage to motherboard), as it hasnt been turned off until now. He says it occasionally crashed for no reason too.

I have also noticed that sometimes the red cpu LED stays on, no other leds light up (no beeps or restarts just stays like that) but if i reset the cmos and flick the power on and off and power via button then resets it posts as normal with no problems until switched off at the wall again. Have tried a different working psu but still the same.

I have decided to replace the motherboard as i beleive that is the problem, should be here in a few days. My brother is also disabled so if he did turn the pc off it would be quite hard for him to reset the pc, id rather make it work correctly and be as easy and reliable to use. Its atleast the only thing i think it can be. CPU is fine, RAM is fine, PSU, HDD, SSD etc all work correctly.

Will let you know how it goes :good:, it certainly is an odd issue :/
 
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tylerjrb said:
I have decided to replace the motherboard as i beleive that is the problem,
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So you replace a motherboard without even one good reason to believe it is defective.

Good diagnostic procedure first identifies a problem before fixing or replacing anything. IOW the CMOS battery should have been measured with a meter before doing anything else. Instead you fixed things on speculation. May have created other problems that only exponentially complicated a solution.

Two diagnostic methods exist. First finds a defect before fixing it. Then problems are solve twice as fast or even faster. Reason for that failure is also known. And something is learned from the experience.

Second solution is called shotgunning. Keep replacing good parts until something works. Sometimes it so exponentially complicates a problem that some will assume everything is defective. Spend massively to replace good parts. Or just end up scrapping a system that originally only had one defective part or loose wire.

The BIOS was just fine for years. Suddenly good software just went bad and requires an update? Nonsense so common with shotgunning; when some never learn how computers works. If additional defects now exist, those would be due to fixing so many other things (ie BIOS, GPU) that were not defective.
 
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i have used several measured batteries and nothing, tried a different PSU and nothing, tried motherboard out of case no different, different RAM. I can switch the pc on now and it will most likely not even power on until the CMOS is reset and forced on via the pins. Even then it takes several attemps to get it to reset successfully and post correctly. At which everything works fine. PC is shut down and power off the PSU then its gone again, date, time everything is reset and another several attempts needed again.

I am pretty certain its the motherboard, it really cannot be anything else, CPU, RAM, PSU everything else is fine.

So to conclude i have ran it outside the case with a good tested battery (infact several), nothing else connected but a tested working PSU and tested working CPU (with cooler) and RAM heck even the bios has been updated and still after all that (no changes). So what does that tell you??
 
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You could solve this by leaving your power supply on, and shutting the computer down from the OS like a normal person.
 
Geoff said:
You could solve this by leaving your power supply on, and shutting the computer down from the OS like a normal person.
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The simple point is i have to reset the cmos several times to get it to reset properly after shutting down (yes on OS) and switching off at the wall. startup takes several attemps to reset it again. Not what i call solving the problem by never turning the socket off again.

Over here in the UK we have switches on sockets and once done we switch things off. After all whats the point burning electric leaving everything on standby?

plus the pc is my brothers not mine, he is disabled. It is almost impossible for him to reset the cmos without me going over to help him. The motherboard is pretty inexpensive so id rather have it work correctly than him be stuck.
 
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tylerjrb said:
The simple point is i have to reset the cmos several times to get it to reset properly after shutting down (yes on OS) and switching off at the wall. startup takes several attemps to reset it again. Not what i call solving the problem by never turning the socket off again.

Over here in the UK we have switches on sockets and once done we switch things off. After all whats the point burning electric leaving everything on standby?

plus the pc is my brothers not mine, he is disabled. It is almost impossible for him to reset the cmos without me going over to help him. The motherboard is pretty inexpensive so id rather have it work correctly than him be stuck.
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I can understand that being the case with lights and so forth, but usually computers sit on desks, which are pushed up against the wall making the outlets hard to reach. You are definitely in the minority with turning power off to the outlet every time you shut down your computer. If you leave it on, you are using just a minimal amount of power.

The pennies it costs in electricity would be worth it IMO then dealing with this issue or replacing the motherboard.
 
I would think its not good killing the power to the power supply over and over. ATX power supplies have a (small) amount of power going through them to the board. Killing the power over and over cant be a good thing.
 
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