PC Won't boot unless CMOS Reset / Discard Bios changes

I just recently started having this problem after a previous PSU exploded on me..
I can only boot if I clear the CMOS.. When I clear it, it resets the bios, so a fan error will pop up forcing me into the bios (H100i works). Now.. When I save and restart, it just shuts off, doesn't start back up. When I discard and start up, it boots into Windows fine. When I do boot into Windows and I eventually shut down or restart, it requires me to clear cmos again.

The P8P67 has LEDs for GPU,HDD,CPU and RAM.. When I try to boot after saving BIOS settings or restarting/shutting down Windows, RAM LED lights up, all fans start up, then LED switches over to CPU briefly, which is when it shuts down.

I've tried swapping out different PSUs, I put in a new CMOS Battery, reseating RAM in different slots, underclocking CPU and lowering timings on RAM.. Nothing seems to be fixing the problem. I'm stumped..

Specs -
Mobo : Asus p8p67 EVO
CPU : i5-3570k @ stock clocks (3.4GHZ) -- Previously OC @ 4.5ghz
RAM : 1x 8GB PNY DDR3 1600MHZ
GPU : Radeon r9 290
PSU : Corsair TX850m
HDD : 500gb HDD
7 answers Last reply
More about boot cmos reset discard bios
  1. Your BIOS chip might've been damaged when the PSU exploded. Can you look around your mobo and find the BIOS chip? You can see whether if its damaged or not.

    Some mobos have replaceable BIOS chips, I'm unsure if your P8P67 supports replaceable BIOS chips though.
  2. Alectfenrir said:
    Your BIOS chip might've been damaged when the PSU exploded. Can you look around your mobo and find the BIOS chip? You can see whether if its damaged or not.

    Some mobos have replaceable BIOS chips, I'm unsure if your P8P67 supports replaceable BIOS chips though.


    Thank you for responding! :D
    I found the BIOS chip near the SATA connectors on the Mobo. I'm fairly certain it's replaceable. So, I'm able to see if it's damaged just by a simple visual inspection? I found a replacement one from Asus for $15 if necessary.
  3. Sometimes you can physically see the damage on the BIOS chip and sometimes you can't, but can you see what appears to be damage on it?
  4. Looking at it while it's seated, it appears to look fine. I can take it out and look at it a bit more though.
  5. It might be an internal problem in the BIOS, and wow I never know those chips are really expensive >.<

    Maybe try buying the BIOS chip, and hopefully it'll fix the problem.

    Let me know if something happens :)
  6. Alectfenrir said:
    It might be an internal problem in the BIOS, and wow I never know those chips are really expensive >.<

    Maybe try buying the BIOS chip, and hopefully it'll fix the problem.

    Let me know if something happens :)


    It's quite odd.. The previous times I've been replying I've been on my PC, doing so from entering bios and discarding saved changes, etc. Now, I was on my PC playing games for a few hours, then decided to shutdown. Just for shits and giggles, I decided to boot it back up and enter the BIOS, ignoring CPU fan monitor and saved changes.. It's working wonders again! I have absolutely no idea what fixed it, but I'm staying away from OCing my CPU for a little while..
  7. O_e

    That is pretty odd indeed. Well glad you got it fixed! :)
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