Question I enabled UEFI secure boot and now I can’t boot to bios???!!!

[DaveXtrem_X]

I enabled UEFI secure boot and now my pc won’t boot to bios??? When I click the power button the pc turns on and the lights from my keyboard light up but the screen is black and there is no sign of the bios. I tried to fit f2, f10, f12, and del to try and go into bios setting but nothing happens and the screen remains black, please help!!!

 

[Lutfij]

Welcome to the forums, newcomer!

You might want to disconnect from the wall, entirely, then remove the CMOS battery from the motherboard for at least 30 minutes. Replace the CMOS battery and try to power up, while spamming the DEL key, to get into BIOS and set everything as needed, without Secure Boot, ofc. Speaking of BIOS, what is the make and model of your motherboard? Don't forget to make sure your storage controller is set to AHCI and nothing else.

 

[DaveXtrem_X]

My motherboard is a Dell XPS 8700 Z87 LGA 1150 and a little background, I have a 500gb hhd and I upgraded to 1tb ssd and cloned my hhd to my ssd and was trying to boot from the ssd but I changed the start up boot to UEFI secure boot and now my pc won’t boot to bios. I tried taking the cmos out for 30 secs three times, but this time I’ll leave it out for 30 mins and report back with an update on the pc, thanks.

 

[Colif]

Could try putting old hdd back in and see if you get any further

 

[DaveXtrem_X]

I have the old hhd in and just left the cmos out for 30 mins and spanned del but nothing then I tried to spam f10 and f12 but nothing, is there another solution I can try?

 

[Colif]

I figured it out. In the process of clearing out the CMOS settings, I found the crucial nugget of information that you have to have the computer plugged into the wall when you do the jumper change in order for the CMOS to be cleared out. The CMOS battery isn't enough to do this apparently so it wasn't working. After plugging it in and doing it, it worked.

https://www.dell.com/community/Desk...y-after-changing-to-Uefi-Secured/td-p/4743049

 

[DaveXtrem_X]

I have a power supply that has a on and off switch should I keep it on when the pc is powered off to reset the cmos?

 

[Colif]

I think you leave it on or the PSU would stop any charge that could reach motherboard if it was off

this is abnormal, usually you have it unplugged.

 

[SkyNetRising]

You might want to disconnect from the wall, entirely, then remove the CMOS battery from the motherboard for at least 30 minutes.

That may not be enough.

1. pc must be disconnected from power;​

2. remove battery;​

3. press power button to discharge PSU high voltage capacitors;​

This should be enough, but if not, then next step will surely reset BIOS​

4. additionally short battery contacts on motherboard or use CLEAR_CMOS jumper.​

 

[DaveXtrem_X]

I tried this but the keyboard and mouse lights just start flickering off and on then stay on while the screen is black, I’m very confused and don’t know what to do???

 

[Colif]

I tried this but the keyboard and mouse lights just start flickering off and on then stay on while the screen is black, I’m very confused and don’t know what to do???

you could ask on the Dell forums as that is where I got the advice from. I would think someone there knows the answer.

 

[DaveXtrem_X]

you could ask on the Dell forums as that is where I got the advice from. I would think someone there knows the answer.

Ok thank u