What broke my MBR ?

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Selman22

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Mar 28, 2016
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I was playing Battlefield 1 and I switched to desktop, and my system got frozen. It didn't respond any key press or anything so I restarted it, I got the famous error message on boot:

"Reboot and Select proper Boot device...."

First thing I did was to go to BIOS and make sure my SSD seen as connected which was where my OS is installed.

Then I plugged in a win10 usb drive, booted from it, run the command prompt and fixed the MBR using these commands:


  • C:
    Bootrec /fixmbr
    Bootrec /fixboot
    Chkdsk /f /r

Then I restarted and the windows loaded successfully. Now, what I wonder is, how did my MBR got corrupted all of a sudden ? Can heat cause this? My CPU gets hot sometimes but how can that cause this, I don't understand. What should I do to not go through the same thing again ?
 
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JackNaylorPE

JackNaylorPE

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Oct 30, 2004
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Don't ya watch TV ? ... It's Obama's fault ! :)

One stray electron or flipped bit and this can happen. Could be dozens of things and no real way to figure out which one but the most common one is shutting system down in mid freeze while it's trying to fix something
 
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Selman22

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Mar 28, 2016
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actually this freezin thing happened many times before, and when I restarted the PC it didn't boot up, it stuck on the first screen, after 3 tries it went to automatic repair and then booted up. This time the only thing different was the error message, and automatic repair which I started manually didn't fix it either. The only common thing about these freezes they happen when I'm playing a game, I have a liquid cpu cooler but it still gets really hot, so I guess this is a heating problem :(
 
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USAFRet

USAFRet

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Given that description...
Either heat, or a dying hard drive.
 
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JackNaylorPE

JackNaylorPE

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Ahhh ... well that's a horse of a different color.

1. Checked the health of the SSD using manufacturer's utility ?

2. Looked in your Windows logs (Open Event Viewer and look for warnings and error entries.

3. Run Stress tests ?

http://www.ozone3d.net/benchmarks/fur/
http://rog.asus.com/forum/showthread.php?43233-Realbench-v2-Discussion-Thread-Download-Links
http://www.hwinfo.com/download.php

a) Start up HWiNFO (sensors only) and move window to rt side of screen; stretch window from top to botton and scroll down to view core temps

b) Rn RoG Real Bench on left side of screen (8 minute benchmark uses 3 heavy duty real world apps and finishes by multitasking w/ all of them)... Watch temps while running.

c) Close RB and open Furmark, scroll down in HWiNFO to GPU and VRM temps and run Furmark for 10 minutes.

Stop tests if ya see anything scary.



 
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Selman22

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Mar 28, 2016
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I have finally found the problem, it was heat. I don't know why I didn't realize before but my SSD was in a cage right under my GPU. So all the heat coming out from my GPU was going right into the SSD. The same problem happened again and this time command line didn't fix it, in fact in first minutes I didn't even see SSD connected in the BIOS, I thought its dead already then it came back after a restart. I had to format and install windows again, I moved SSD to somewhere else and didn't have a problem so far.
 
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