To anyone who can help:
I had a Dell Precision M4700 and i had perform the newest bios A05 update.I intended to upgrade to Windows 8. Everything was fine and the bios update was successful. I booted the new bios with Windows 7 Professional (base OS factory installed) and was fine.
However, i can't enter the bios (not even see the Dell POST or Logo) after i had enable the UEFI and Secure Boot.This was before i upgrade to Windows 8 Pro. Now i am stuck with a empty screen (LCD not even lit up) and nothing to boot. It's just like a dead PC.
Please help. Is there anything that i can do or should i contact Dell Support for repair?
Solved! Go to Solution.
I have exactly the same problem! I'm on the A06 bios, brand new machine, and was starting to upgrade to Windows 8 so switched the bios to UEFI mode and disabled Legacy BIOS Option ROMS and then saved and applied. I didn't enable Secure Boot, but it could possibly have been enabled by default once you turn on UEFI? I remember there being some message about Secure Boot and the display but I can't remember what... maybe somebody with a working one can let us know?
I called Dell and they got me to go through taking RAM out and trying to run diagnostics, but nothing brought it back. They're coming out with a new motherboard tomorrow.
I thought maybe my motherboard was just busted till I saw your message. Maybe it's a bug with the new bios?
So I guess you'll have to call Dell to fix it up. I'll let you know if the tech discovers anything tomorrow.
Yeah, totally the same problem as you except that i enable the Secure Boot. I followed the steps as:
1. Enable UEFI mode.
2. Disable Legacy BIOS Option ROMs.
3. Enable Secure Boot.
4. Save and exit BIOS
I had yet to formatted the computer to install Windows 8 and it fails.
After that, my laptop refuses to boot up. It tries to check for HDD and DVD and then the screen doesn't lid up. No Dell POST or Dell Logo. I think the main culprit is the bios bug.
I had called Dell support on this issue, i had tried booting without HDD but still faiture. I think the bios is blocking everything.
PS: Are you having Dell Precision M6700 (as it is A06 bios). Mine is M4700 (A05 bios).
By the way, I read up more on the Legacy BIOS options ROMs.
I am suspecting it has something to do with that since you mentioned you disable that without enable the Secure Boot.
What GPU are you having in your Dell Precision mobile workstation? Mine is Firepro M4000.
Yep, M6700. I've got the ATI card too, FirePro M6000.
I thought it might be the legacy option rom thing too. I disabled that because I figured I would install Windows 8 then enable Secure Boot, and they need to be disabled for Secure Boot anyway.
And my HDD lights do the same as yours. It checks the HDD, but nothing comes on screen. I tried putting in the WIndows 8 DVD to see if that started going, but it didn't appear to. So I guess the machine has halted rather than just the screen stopping.
Pity there isn't a way to reset the BIOS back to factory defaults.
Was wondering if it's the problem with the ATI Firepro card. Maybe it doesn't support UEFI driver, that's just my guess since the screen doesn't lit up. Or maybe it's other problem, like storage controller.
Hopefully Dell will sort out this bios problem before more people get trapped at this Secure Boot/Legacy Option ROM thing.
I will call Dell to ask whether there is anyway to reset BIOS to factory defaults, if not they will had to replace the motherboard for me.
Here's an interesting link about video cards and Secure Boot.
So I guess it is the video card that's the problem. I also checked the Windows 8 compatibility page for the M6700 and it only says that the Nvidia cards might have problems with Secure Boot, not the FirePro.
WOW, great find. We could take out the graphics card and run the system using integrated graphics card and reset the bios without secure boot.
I don't know whether this will void the warranty though. I will update on this matter after i call Dell in a moment. This will save them the trouble to exchange a motherboard. If not, let them know this issue when they come to service, if this is the true problem, we could save Dell a brand new motherboard.
Thanks for sharing the information.
I fixed it! Just removing the CMOS battery did it, the BIOS got reset back to factory default. So I did:
1) take out battery
2) hit power button to ground case
3) take off bottom panel
4) unplug CMOS battery (this is fiddly)
5) I hit the power button for a while (30s) to clear any capacitors or whatever, that was my theory, but I doubt that's necessary
6) plug it all back in and start up
When I turned it on it turned on and off several times before finally staying up and I was then able to get into the BIOS and all of the settings were restored to factory default. I'm back into Windows 7 on my machine so I'll start the process again, this time without disabling the legacy option roms!
Here's the manual with disassembly instructions for the Precision M6700 and M4700 if anybody needs it:
I told Dell support about the problem and the guy said he would talk to his senior manager about it and see if anything should be done, so I guess we'll see if anything happens.
Hope it works for you!