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CMOS battery? or Mobo in general?

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  • Asus
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  • CMOS
Last response: in Motherboards
July 6, 2014 11:46:20 PM

Hi guys,

Been having an ongoing issue that I'm not really sure how to fix. My computer recently (and a few months prior) had an issue where when I turned on the computer, the computer fans go on, looks like everything is running, but nothing shows up on the screen, no lights on keyboard or mouse, no beeps. On occasion, when this happened, it would turn on for a few seconds, shut down by itself, then reboot, only to lead to the same un-usable, black screen state. Only one thing allowed me to get the computer back to normal, resetting the CMOS by taking out and reseating the CMOS battery on the mobo.

As for testing, I don't have any spare parts, outside of a keyboard, but I have tried a few other things to test the computer. I used a micrometer to test all the wires from my PSU, and as far as I could tell, it was testing normal. I checked all cards to make sure they were seated properly, inspected everything to look for busted capacitors or anything that looked broken (none). I unplugged any unessential hardware and had tried turning on the comp that way, but that hadn't helped. The only thing that worked, as I mentioned, was resetting the CMOS.

Now, I'd like some advice on what to do next. As of now, the computer is working. However, just yesterday, after I had reset the CMOS and turned it back on to try and play a game, the computer shut down after a few minutes and when I tried to turn it back on, same problem. I reset the CMOS battery again, and kept it running for a few hours now to try and charge it. So far I've been ok for about 6 hours. I'd rather not gamble on whether or not this is going to stay this way, so I'd like advice on how to go about checking my computer for other problems. I'd like to replace any suspicious hardware before anything catastrophic may happen.

Thanks for any advice.

Hardware: (mostly from 2008)
Mobo: ASUS P5Q SE PLUS
Proc: Intel Core 2 Duo E7300 Wolfdale Dual-Core 2.66GHz
Ram: OCZ Platinum 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500)
PSU: CORSAIR TX Series CMPSU-650TX 650W ATX12V / EPS12V SLI Ready CrossFire Ready 80 PLUS BRONZE
Video: ASUS EAH6770/DI/1GD5 Radeon HD 6770 1GB 128-Bit GDDR5 (From 2011)

More about : cmos battery mobo general

July 6, 2014 11:55:37 PM

Also, I have not changed or added any hardware recently.
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a b V Motherboard
a b à CPUs
July 6, 2014 11:59:53 PM

First reset CMOS & take out the battery for a while!
Then remove everything except CPU, Ram, Power supply. And check whether you get the bios screen or not.
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Related resources
a b à CPUs
a b V Motherboard
July 7, 2014 12:22:50 AM

As harry_r_s says with one addition, try with one RAM stick at a time, one might've gone bad.
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a c 192 V Motherboard
a c 179 ) Power supply
a c 169 à CPUs
a c 122 Ĉ ASUS
a c 90 } Memory
July 7, 2014 1:56:30 AM

1.dont try charging the cmos battery. install a new one.
2.ensure your tower is dust free cpu cooler is properly mounted onto cpu and fans are operational.
2.your psu is a good one and is more than your pc needs. you can check though if it overheating - fan is operational or if it produces any wierd noises.any of these are signs of a dying psu.
3.after a succesfull post go into bios and get a reading on cpu temp and voltages if possible
4.if temps and voltages seem right on bios re check them through windows but this time under load. use Real Temp and hdwmonitor
5.get a temp reading on gpu on idle and under load through gpu z
6. run a memtest on one dimm installed at a time
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July 7, 2014 9:35:19 PM

Thanks for the responses guys, I'll try to go through them. I also tested the battery with my multimeter and it was reading at about 3.1V so I think the CMOS battery is fine... I'll keep it in mind.

Recently when I went through the BIOS after reinserting the CMOS battery, I think I saw that the CPU temp was 30C/90C. Seems reasonable to me? I'll double check again.
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July 9, 2014 10:00:45 PM

So far as I can tell... which is just from listening and observing the PSU, it doesn't seem to be having any issues. The fan runs pretty quiet, smoothly, and no funny noises.

Ran RealTemp, idle CPU temps range from 39-49C. When I ran the Load Tester, temps didn't change much, ranged from 42-50C. According to HWMonitor, voltages of idle CPU VCORE range from 1.104V-1.184V; and temps on there are about the same as from RealTemp.

I ran GPU-Z and idle temp is about 40C. I've been running the render test for a few minutes now and it seems to have stabilized at 74-75C.

One thing I did notice, though I have no idea if this is important or not, is that the +12V value from HW Monitor is 11.598. Seems a little low, but I think I read somewhere that it's within normal limits. Any other opinions on this? How does everything else look?
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a c 192 V Motherboard
a c 179 ) Power supply
a c 169 à CPUs
a c 122 Ĉ ASUS
a c 90 } Memory
July 10, 2014 12:37:31 AM

quitetheguymi said:
So far as I can tell... which is just from listening and observing the PSU, it doesn't seem to be having any issues. The fan runs pretty quiet, smoothly, and no funny noises.

Ran RealTemp, idle CPU temps range from 39-49C. When I ran the Load Tester, temps didn't change much, ranged from 42-50C. According to HWMonitor, voltages of idle CPU VCORE range from 1.104V-1.184V; and temps on there are about the same as from RealTemp.

I ran GPU-Z and idle temp is about 40C. I've been running the render test for a few minutes now and it seems to have stabilized at 74-75C.

One thing I did notice, though I have no idea if this is important or not, is that the +12V value from HW Monitor is 11.598. Seems a little low, but I think I read somewhere that it's within normal limits. Any other opinions on this? How does everything else look?


well everything does look good, so most probably a psu issue. you must try another psu to make sure. also before you do go through this list (focus on section 3 and 18) http://www.tomshardware.co.uk/forum/261145-31-perform-s...
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July 14, 2014 10:05:31 PM

So... my problem happened again yesterday though I'm not sure exactly how it happened because my cat was near my keyboard. I was using the computer normally, and suddenly my cat laid down near my keyboard, where there happens to be a "Sleep" button. The computer seemingly powered down and I waited for it to finish powering down, and then tried to restart it. Unfortunately, it didn't boot all the way like before (nothing on monitor, no keyboard/mouse, normal lights not on, but fans running). I powered off with the power switch, and tried to turn it on again, same result. I eventually reset the CMOS battery again today, and I'm able to use the computer again.

Does this shed any new light on my problem?
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