Unsolved
89 Posts
0
2685
M6700 blank screen during Secure Boot
I enabled Secure Boot in my M6700. Now I cannot enter UEFI (BIOS) setup. The screen does not show the Dell logo, it's just black. But if I turn the power off and back on, and do not press F2 or F12, and wait, then Windows boots and the screen is normal after that.
I updated the UEFI (BIOS) to A20 before enabling Secure Boot. F2 and F12 were working normally before I enabled Secure Boot.
How can I fix this?
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Addendum: I disconnected the CMOS battery in hopes of resetting whatever got messed up. And reconnected the CMOS battery. NOW IT DOESN'T BOOT AT ALL. COMPLETELY BRICKED.
HOW CAN I FIX THIS?
Norman Diamond
89 Posts
0
December 11th, 2019 05:00
oBirle
1 Message
1
May 31st, 2021 06:00
This is how I unlocked a Dell Precision M6700 laptop with blank display at power on next to enabling secure boot in BIOS version A20.
The issue is the lack of power on display (dark screen) to enter BIOS after enabling secure boot via F2 or F12.
Hope this helps !
Norman Diamond
89 Posts
0
May 31st, 2021 07:00
"5. After keboot the POST Dell logo appears."
No it does not. The K4000m graphics card has firmware that doesn't support EFI, so it will not display anything, not even the logo. The display does have power (not dark screen) which can be verified by doing a screen test: Press and hold the keyboard's "D" key before powering on, which will test the screen instead of booting the computer.
On the other hand, I've read that if the screen is sufficiently low quality then there's a way to bypass the K4000m graphics card and use the low quality Intel graphics chip instead. A screen swap should be easier than removing the K4000m graphics card and attaching an external monitor. After disabling secure boot and enabling legacy option ROMs, you can swap back to your original high quality screen.
secureBOO
1 Message
0
October 1st, 2022 16:00
Thank you! This solution worked for me on my Dell Precision M4700 with Nvidia graphics after unsuccessfully trying to reset the CMOS battery or any other solution proposed.
Jean46
1 Message
0
October 5th, 2022 17:00
I thought this was a joke but it worked! KUDOS!