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17 Posts
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November 3rd, 2017 09:00
Optiplex 780 - Odd Behavior After New CMOS Battery
We were given several Optiplex 780s that I've been fixing up for family.
I did most of the work a couple years ago.
Have the last one and it needed a new CMOS battery - replaced it.
BIOS is A15
Installed a 500GB hard drive and tried to image it with a Win 7 64 image.
Will not boot gets to loading win then back to BIOS, then menu to launch repair.
When I go into the BIOS setup to try setting it for AHCI SATA mode it says no
boot device when trying to boot - this doesn't seem normal.
Also the boot order will not change.
Could the BIOS be screwed up? Ideas?
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PeteB2017
17 Posts
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November 3rd, 2017 10:00
Thanks for those, will read them in depth.
Should I try the battery removal for 10 minutes? I only did it for one minute
pressing the power switch with no power.
The weird thing is that it tries to boot when the SATA mode is set to RAID/ATA
but when set to RAID/AHCI BIOS doesn't see the drive anymore and it says no
boot device when trying to boot.
If I put the same drive in an Optiplex 755 it sees the drive in either mode.
robert p
4 Operator
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9.4K Posts
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November 3rd, 2017 10:00
Hi PeteB2017,
Thanks for posting.
Apologies that your system is not working as you expected.
Here is some information other users have posted that you may find helpful: http://dell.to/2ztPzii
http://dell.to/2ztmdAB
http://dell.to/2ztZNPZ
speedstep
9 Legend
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47K Posts
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November 3rd, 2017 11:00
AHCI vs ATA vs RAID will produce STOP 0x0000007B INACCESSIBLE_BOOT_DEVICE. You cant move drives from machine to machine. AHCI requires F6 mass storage drivers.
If you have recently made changes to BIOS settings, such as changing the controller mode from ATA legacy to AHCI in the BIOS, revert those changes.
This can also cause
https://support.microsoft.com/en-us/help/2795397/
PeteB2017
17 Posts
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November 3rd, 2017 18:00
I am aware of that, the image I tried to restore is from a system set up for AHCI
and worked on that system. I've used one image to install new drives in probably
10 systems. I simply enter the COA tag number off of the case for each one. If
the image was from a system with AHCI then that is how I set the BIOS.
The issue is that when I try to set the BIOS to match, system claims that there
is no boot device so I can't even try to boot from the drive.
I've done a lot of Win 7 installs and never had this issue.
When I stated that it gets to the loading Win7 screen that was when it was set for
Raid/ATA.
PeteB2017
17 Posts
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November 9th, 2017 11:00
This system had a bad RAM stick but it still will not go into AHCI mode, not
sure why but it is good enough in ATA mode with a mechanical drive.