Windows 10: Uninstalled drivers with DDU, now Windows won't boot

Did you ClrCmos after the Bios flash or pull the battery for 5 mins? (to ensure everything was refreshed) then go into bios and set optimised defaults?

One sounds like it is ready for a cookie Sheet *Smile

Can you boot off a DVD or USB to say Kyhi's Boot Disk 160707 ? or macrium Rescue disk

Windows 10 Recovery Tools - Bootable Rescue Disk

if so try the Macrium Fix Windows Boot issues Option , incase the Current boot issue is not GFX Card related just a messed up Boot File or two.


KB

 

another thought.....

Did you ensure after flashing the bios that the Boot Order in the Bios is correct ?

If UEFI it should say Windows Boot Manager 1st

If Legacy install it should have your HDD/SSD as the 1st HDD

it may show USB or CD as 1st boot item if legacy but that shuld not matter if neither has a bootable Disk available it should then boot the HDD auto after not finding the others....


KB

 

Just did a quick experiment, after reading this thread, which I feel is confirming my suspicion that the problem lies with Windows 10 continuously overwriting any changes I make to both the BIOS and Windows.

I went into the UEFI BIOS menu and changed one of the settings so that it prioritizes PCIE over the onboard video.





Then I rebooted, went into Windows 10 Device Manager and Disabled the onboard video. Shut down, installed the 7970 card...and voila, I was able to get into Windows 10!

...except I couldn't interact with anything using the mouse or keyboard. I could see my desktop, I could see the mouse pointer moving around, and the backlights on my keyboard were lit up like there wasn't a problem, but I couldn't do anything. I reset the computer and suddenly the problem was back.

I removed the card, rebooted again, checked the UEFI BIOS menu and lo and behold, the setting I had changed to PCIE was changed back to Auto. Then I logged in to Windows 10, checked the Device Manager...and the onboard video was Enabled again.

I feel like at this point I'm just being effed with by Windows 10. It refuses to store the settings and changes I want, and keeps returning things to some kind of default state that I have no control over.

 

I had a similar problem when I could not boot win 10 with my Nvidia 760 (also had a PSU failure), but would boot with onboard graphics, ended up being a corrupted BIOS, flashed a newer (than I had) BIOS and it boots fine with the Nvidia card now.

 

Perhaps I am missing something ? but the 2nd pic looks the same as the 1st pic to me.....

Cant you disable the iGPU in the Bios completely ? ie set them all to disabled ? , it wouldn't surprise me if that is somehow overriding the setting if not....


KB

 

The second pic is the first pic, it's just showing the same file again after I made one small edit to highlight the field I was talking about. I edited the post to only show the highlighted pic.

And if there's a way to disable the iGPU outside of that screen, I'm not seeing it in the BIOS. But it doesn't explain why settings I'm changing in the BIOS and in Windows 10 Device Manager are reverting.

 

My problem is I've had the newest BIOS since May. I just flashed it again yesterday, hoping it might clear up whatever issue is going on, but there's been no improvement.

 

On some MB bios's you can disable the iGPU completely and just use the PCIE Card option (Discrete Graphics) , though it is hard to tell if selecting PCIE is disabling the iGPU or just setting a priority since I think multimonitor as referenced in the Bios means so you can use the IGPU AND PCIE at the same time if desired but you MB Manual ain't any help really it refers to the Original bios way back when Adam was a Cowboy..... however I would Disable the Render standby and iGPU memory if possible.

***edit.......Ok been googling and your MB is PITA apparently *Smile I found a post or two saying that your MB has an issue with the iGPU not being disabled properly even though PCIE is enabled and the only fix to solve it was to use an OLDER BIOS...... eg

Asus P8Z77-V iGPU always enabled | TechPowerUp Forums

OK found a longer thread here too

Bad problem with Asus P8Z77-V with onboard graphics - Overclockers UK Forums


See posts #26 onwards ....... seems if iGPU EVER gets activated it will stay that way ..... The OP has your videocard too BTW

KB