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Thread: BIOS Reset by itself, and Shutdown issue. Need help identifying cause.

  1. #1
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    • djsarcher's system
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    BIOS Reset by itself, and Shutdown issue. Need help identifying cause.

    First off, system specs, all around 4 years old:
    Asus P5Q-E MoBo
    Intel Core 2 Duo E8500 @ Stock (3.16GHz)
    4GB G.Skill 1000MHz DDR2 @ 800MHz (was at 1000MHz before issues below)
    HIS ATI Radeon HD4850 1GB
    Corsair TX650W PSU
    3x HDD
    1x ODD
    Asus Xonar DX

    So last night this PC gave me a scare, as it was about to sleep, heard all fans kick in to max speed, then reboot.
    Only it rebooted with default BIOS settings, so didn't detect boot drive. Changed BIOS back to normal, and it got through post, from which I saw that all hard drives (SMART) reported OK.

    Took a long time, but did boot back into windows, very slowly. Checked GPU/CPU temps, all seemed ok, system seemed to be running normal.
    So I tried to reboot, see if boot time went back to normal, and it hung on reboot. The GFX card fan seemed to spin up to max, so opened the case and had a look,and the GFX card had an LED on, labelled D1602, which from some searching tells me it shows a EXT12V Fault. So thinking it could be the PSU on its way out?

    Turned it off and on again, booted up slowly again, but no warning led on graphics card, until I sent it to shutdown again, came on briefly before the system turned off on its own.

    BIOS shows +3,+5, and +12V lines all a bit under their targets, but not massively, I remember +12V was 11.92, think +5V was around 4.95.

    Would appreciate a second opinion before I look at buying anything, but am thinking it could be any of the PSU/MoBo/GFX.
    Last edited by djsarcher; 13-01-2014 at 02:06 PM.

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    Re: BIOS Reset by itself, and Shutdown issue. Need help identifying cause.

    First off, I'd look at replacing the CMOS chip backup battery. The COS chip contains the system real time clock, and, more importantly, the BIOS parameters. They are usually a CR2020 coin cell (or similar) and will cost you a couple of pounds at most. Check the size before you buy the replacement!

    I'm not saying that is the problem , but the fact he BIOS went back to the default settings is one symptom of a failing battery.
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  3. #3
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    • djsarcher's system
      • Motherboard:
      • MSI G45 Z77
      • CPU:
      • intel 4670K
      • Memory:
      • 8GB 2666MHz
      • Storage:
      • 120GB Crucial M500
      • Graphics card(s):
      • Powercolor R270 1GB
      • PSU:
      • Corsair TX650
      • Case:
      • Antec 300
      • Operating System:
      • Windows 8.1 / 10 Preview
      • Monitor(s):
      • 2x Viewsonic 22" 1080p TN
      • Internet:
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    Re: BIOS Reset by itself, and Shutdown issue. Need help identifying cause.

    Good point, will check the CMOS battery later then, see if I have one to swap out.

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    • djsarcher's system
      • Motherboard:
      • MSI G45 Z77
      • CPU:
      • intel 4670K
      • Memory:
      • 8GB 2666MHz
      • Storage:
      • 120GB Crucial M500
      • Graphics card(s):
      • Powercolor R270 1GB
      • PSU:
      • Corsair TX650
      • Case:
      • Antec 300
      • Operating System:
      • Windows 8.1 / 10 Preview
      • Monitor(s):
      • 2x Viewsonic 22" 1080p TN
      • Internet:
      • ADSL2+ 16Mb/1Mb

    Re: BIOS Reset by itself, and Shutdown issue. Need help identifying cause.

    Pulled the CMOS out to check, its a CR2032, and was reading 3.16V, so that should still be good, but I had a spare that read out at 3.36V, so I've put the new one in anyway just to rule it out.

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    • TheDutyPaid's system
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    Re: BIOS Reset by itself, and Shutdown issue. Need help identifying cause.

    Just thinking your PC could have just crashed as they do sometimes and kicked into restart but your BIOS decided to play it safe and load factory settings so to speak. The RAM timings reset and fan going full blast is a sign of this.

    As for the trusted CR2032, 3.16v is fine. I have started up 15 year old machines and they still have there BIOS battery dependent settings.

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    Re: BIOS Reset by itself, and Shutdown issue. Need help identifying cause.

    Also check for CMOS jumper shorts on the motherboard, sometimes a short can result in random shut downs and CMOS wipes.

  7. #7
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    • djsarcher's system
      • Motherboard:
      • MSI G45 Z77
      • CPU:
      • intel 4670K
      • Memory:
      • 8GB 2666MHz
      • Storage:
      • 120GB Crucial M500
      • Graphics card(s):
      • Powercolor R270 1GB
      • PSU:
      • Corsair TX650
      • Case:
      • Antec 300
      • Operating System:
      • Windows 8.1 / 10 Preview
      • Monitor(s):
      • 2x Viewsonic 22" 1080p TN
      • Internet:
      • ADSL2+ 16Mb/1Mb

    Re: BIOS Reset by itself, and Shutdown issue. Need help identifying cause.

    The general clean (and perhaps unnecessary CMOS replacement) seems to have helped, PC booted up fine last night, still seemed a bit slower than normal, but maybe just due to usb devices being plugged in different places requiring driver installs.

    Will get the voltmeter out tonight and check the PSU voltages. Still a bit concerned that it could be on its way out.

  8. #8
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    • djsarcher's system
      • Motherboard:
      • MSI G45 Z77
      • CPU:
      • intel 4670K
      • Memory:
      • 8GB 2666MHz
      • Storage:
      • 120GB Crucial M500
      • Graphics card(s):
      • Powercolor R270 1GB
      • PSU:
      • Corsair TX650
      • Case:
      • Antec 300
      • Operating System:
      • Windows 8.1 / 10 Preview
      • Monitor(s):
      • 2x Viewsonic 22" 1080p TN
      • Internet:
      • ADSL2+ 16Mb/1Mb

    Re: BIOS Reset by itself, and Shutdown issue. Need help identifying cause.

    Quote Originally Posted by TheDutyPaid View Post
    Just thinking your PC could have just crashed as they do sometimes and kicked into restart but your BIOS decided to play it safe and load factory settings so to speak. The RAM timings reset and fan going full blast is a sign of this.

    As for the trusted CR2032, 3.16v is fine. I have started up 15 year old machines and they still have there BIOS battery dependent settings.
    Looks like you're spot on, been working fine since.

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