losing boot order on SATA drivers ASUS P8Z68-V PRO bios Rev 0501

hardwareuser

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Feb 21, 2015
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Anyone seeing this?

My system mobo has this problem:

I am occasionally losing boot order on SATA drivers ASUS P8Z68-V PRO bios Rev 0501.

This happens minimum 2-3 times a year. 1) It loses the order, and tries to boot off the wrong drive. My other drives have stale Linux installations so it usually doesn't work then. So if I can figure out the right order, easy to fix. My intended drive has Windows 10, not key to the issue just an incidental.
2. OR; it completely loses recognization of the drive with Windows on it. In BIOS, you cannot see it, period. In that case, I unplug the power cable and wait an hour or so, then try again.

This has been happening more frequently lately, I think because Windows 10 has been driving in some updates requiring reboot.

I don't remember if I've replaced my CMOS battery lately. I'll check it over.

I just updated to rev 3402 bios for this board from ASUS so will be interesting to see if the problem diminishes.

The problem preceeded me adding another HDD on which I put Windows 10. At that point I had two drives in which I was juggling Ubuntu and Mint, and the same issue happened there, occasionally.

== > Later That Day ....

BIOS update didn't help. Toggled some other BIOS setting, the drive I wanted disappeared on the next reboot, then came back after leaving unpowered a while.
 
can be two issues. one the drive is going bad...check the drive firmware make sure there up to date and run there vendor test tools. the other issue is a bad power supply and the drives are not getting the right power when the power supply fails. use hardware info see if the power is fine in your pc.
 

hardwareuser

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Feb 21, 2015
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18,515


Thanks for suggestions. Well, the disks are basically new, purchased in last 2.5 years. I did run some disk tests before, doing it again (the short seagatetools tests).

While digging into it I see in event log I am getting some unexpected reboots. And I'll run some mem tests; I did that before too, but don't remember what I used. At that point I had tried to use some mis-matched DIMMs (compatible but different sizes). That definitely caused rather frequent unexpected reboots and after abandoning that reboot issues had seemed to go away.

HWInfo doesn't find any info on my PSU, which is a thermaltake 800W that I think is 5-6 years old now. But I can definitely consider replacing. I found a superuser article mentioning some other components such as capacitors and I'll see if I can see any obvious corruption on the board when I look at the board & PSU more closely.